Registration is open for CalConnect XXXV at AOL in Palo Alto, California, January 11-15, 2016

Registration is now open and hotel reservations may be made for CalConnect XXXV in Palo Alto, California, January 11-15, 2016, hosted by AOL.

The CalConnect XXXV web page is located at and contains hotel information and booking, airport and transfer information, meeting venue, international travel information, etc.

We have moved the event forward two weeks because the Superbowl will be in Santa Clara in early February, which means that hotel bookings are already getting difficult and rates are going up even for our new dates of 11-15 January. Therefore, if you are planning or considering coming to this event we strongly encourage you to book your hotel as soon as possible! And you are encouraged to register at the same time.

The conference hotel is Dinah’s Garden Hotel in Palo Alto. The hotel is offering an AOL rate of $240 per night, however that may depend on availability as the hotels in the area are already filling up and raising their rates. The conference hotel is about 1.5 miles from AOL’s headquarters at 395 Page Mill Road, Palo Alto, California 94306. The web page for the event also lists other hotels which may or may not offer an AOL rate during our target week.

We will be at AOL’s headquarters for the entire week, as noted above at 395 Page Mill Road, about 1.5 miles from the conference hotel.

Please note that, to obtain the AOL rate at the Conference Hotel, you cannot book online. The event web page offers telephone numbers for the hotel; please call the hotel to book, and say you want the AOL rate.

A preliminary schedule for the week ss posted on the event web page. The interoperability test event will take place Monday, Tuesday, and Wednesday morning; the Conference will be Wednesday afternoon through Friday. We will be using our new format for the conference; most conference sessions will be higher-level strategy and cross-TC, with some specific very detailed discussions held during the interoperability test event. We expect that the schedule and program will evolve over time, so check the web page periodically. The conference program has not been determined as yet so only an outline of meal and break times is available. We will announce immediately when the conference program has been finalized.

Highlighted Sessions at CalConnect XXIV in Amsterdam

We have several sessions planned for the CalConnect Conference in Amsterdam (September 30 – October 2) that we feel are of special interest and should be highlighted:

Wednesday September 30

Event-type Registry:
Developing standard categorizations for event publication to aid searching and relating events.

Calendaring in Government Panel Discussion:
Citizens, companies and governments are looking for ways to ease and standardise communication. Time related information could very well be communicated via existing standards and systems. Topics include what makes governments special when it comes to C&S; what are governmental use cases?
This session is open to the public by invitation; e-mail us if you are interested in attending.

Thursday October 1

Developing a new lighter-weight API for calendaring.

Scheduling model changes
Extend the enterprise scheduling model to support the social calendaring interactions which takes place today. For example, multiple organizers, self-invitation(signup) etc.

Recurrences – alternative models
A new model to avoid the issues with long running recurring events that are always modified. For example the weekly meeting with a different agenda.

Friday October 2

RSCALE – non Gregorian calendar scales
How RSCALE allows non-Gregorian recurrences to be specified as part of iCalendar events.

Publishing events with QRCODE and data URI
Formulate an approach to publishing events within the limitations of QRCODEs and data URIs; develop rules for publishing recurrences and instances.

For the complete schedule of the CalConnect Conference please see

Registration is open for CalConnect XXXIV in Amsterdam 28 September – 2 October 2015

Registration is now open and hotel reservations may be made for CalConnect XXXIV in Amsterdam, The Netherlands, Sep 28 – Oct 2 2015, hosted by Gershon Janssen.

The CalConnect XXXIV web page is located at and contains hotel information and booking, airport and transfer information, meeting venue, international travel information, etc.

The conference hotel is The Motel One Amsterdam-RAI which is brand new (it opens in mid August) and doesn’t have a web page yet. Our host, Gershon Janssen, has arranged a special room rate of about €110 per night at the hotel (this is an average for a single room; prices Sunday-Tuesday are much higher than Wednesday-Friday). We have a room block of 20 rooms which will expire 1 September after which no guarantees of price or availability.

The hotel is about 800 meters from the venue, The Rosarium Amsterdam. We will be at the Rosarium for the entire week.

Please note that, to obtain the special CalConnect rate, you cannot book online; the event web page offers an e-mail address or a telephone number which you may contact to request a booking, referring to the “CalConnect” group code. The hotel will call back as needed or e-mail you to confirm particulars including a credit card if you wish to guarantee the booking.

If you wish to make alternative hotel arrangements, please be aware that due to a large medical convention in the same area of Amsterdam the same week. hotel rooms are pretty limited, and it would be wise to book as soon as possible.

A schedule and conference program is posted on the CalConnext XXXIV web page. The interoperability test event will take place Monday, Tuesday, and Wednesday morning, as usual; the Conference will be Wednesday afternoon through Friday. Our format will follow that of our last meeting: most Conference sessions will be higher-level strategy and cross-TC, with some specific very detailed discussions held during break-outs in the interoperability test event. We expect that the schedule and program will evolve over time, so check the web page periodically.

Hope to see you in Amsterdam for CalConnect XXXIV; please contact us with any questions.

Highlighted Sessions at the CalConnect XXXIII Conference in Bucharest

CalConnect XXXIII consists of an Interoperability Test Event Monday through Wednesday noon May 18-20, and a CalConnect Conference Wednesday afternoon through Friday May 20-22. The schedule for the entire week may be seen at CalConnect XXXIII Conference Schedule.

We would like to draw your attention to a few highlighted conference sessions:

Wednesday May 20:

1445-1530 Embedding Calendar Data in Media (QRCODE, Data URI)
Using QRCODE and Data URIs to make calendar data available without networking

Thursday May 21:

0900-0945 Changes to the scheduling model
The current enterprise-meeting-oriented scheduling model does not address all scheduling needs, e.g. multiple organizers or no oganizer are common models that are not supported. This session will explore additional scheduling models that should be added to the existing standards.

1600-1630 Calendaring Systems in General (solar, luni-solar, etc.)
1630-1700 RSCALE: Non-Gregorian Recurrence Rules in iCalendar

These sessions will discuss how recurrences can be implemented for non-Gregorian calendaring systems using the RSCALE iCalendar extension, and will explore non-Gregorian calendaring systems from an historical perspective, in particular those involved in digital calendar today or in the near future.

Friday May 22:

1145-1230 Sending invitations through other means than e-mail
E-mail is often not the primary vehicle for messaging among people Instant messaging and other services should be considered as a way to deliver invitations and notifications. New mime types are a possible solution.


Which means two weeks until the Registration Fee for the CalConnect Conference goes up from $350 to $395 – after Friday 1 May 2015, so register now.

General Information:

Logistics information for this event may be found at including registration information, venue, travel, hotel, and other planning information. The session schedule is on the web page referenced; the full schedule and agendas will be updated shortly. As usual for European events, Monday, Tuesday, and Wednesday morning will be the interoperability test event; Wednesday afternoon through Friday will be the CalConnect Conference.

The Conference is at the Skytower, 246C Floreasca Street, District 1, 014476 Bucharest, Romania, 34th floor. The Conference Hotel is the Caro Golf Hotel about 500 meters from the Skytower.

I encourage you to register as soon as possible as early registration helps us with event planning and logistics, in addition to restaurant reservations. (Please remember that you need not pay when you register; if desired you may wait until the event and pay by credit card.)

About the Interoperability Test Event:

The information page for the Interoperability Test event is at Please see this page for the current list of areas we plan to test; it will be updated regularly as testing registrations and requests are received. In addition, participants may have other areas they wish to test and we will be happy to include them in our planning; the test event registration form provides a place to indicate what you want to test. In all cases at least two participating organizations must be interested in testing a particular area or scenario to form testing pairs.

About the Conference:

More information about the format and the schedule of events may be found at Early registration for the conference will be $350 through 1 May. Please note that the early registration fee applies so long as you register <= 1 May even if you don't actually pay until the event.

We invite you to join us in Bucharest for CalConnect XXXIII, May 18-22.

CalConnect’s fifth European event is this spring! You’re invited to join us in Bucharest, Romania, at 1and1, May 18-22, 2015

CalConnect – The Calendaring and Scheduling Consortium – is returning to Europe this spring

Our previous European conferences, in 2011, 2013 and 2014, were very successful. In the past we’ve come to Europe in the autumn, but we’re coming early. CalConnect XXXIII will take place in Bucharest, Romania, on May 18-22, 2015, hosted by 1and1.

We encourage our European colleagues and others interested in Calendaring and Scheduling to join us. We’re working to make this event as attractive as possible to organizations that are not currently members but have thought about exploring CalConnect, and a European event is a chance for people to participate in a CalConnect event without having to incur the travel costs and time of coming to North America.

CalConnect is a collaboration between calendaring and scheduling vendors and users. It was established to further interoperability between calendaring and scheduling implementations, and works towards this purpose by driving the evolution of calendaring and scheduling standards through technical committee work, holding regular interoperability testing events, and hosting regular conferences, workshops and symposia focused on calendaring and scheduling.

European companies were among CalConnect’s earliest members, and as standards and interoperability are both central to CalConnect’s mission and are strong core values of European Information Technology, we have long recognized the importance of increasing European involvement in CalConnect. To that end we held special events in Europe in 2007 and 2008 in preparation for our first regular CalConnect conference in Europe in 2011. This spring’s event in Bucharest is one which we hope will continue with even greater European participation in CalConnect’s interoperable calendaring and scheduling efforts, and we applaud the increased involvement by Europeans in our technical activities over the last few years.


Our venue will be 1and1’s Romanian headquarters in The Skytower, 246C Floreasca Street, District 1, 014476 Bucharest, Romania. The conference hotel is The Caro Golf Hotel, only 500 meters from the Skytower. All events of the CalConnect week, except for the Monday Test Event dinner and the Thursday Conference dinner will take place at the Skytower. Full information about the conference may be found at CalConnect XXXIII including the week’s preliminary schedules registration, and logistics information, including transfers from the airport, Henri Coandă Airport Bucharest – Otopeni to the hotel.

Monday, Tuesday, and Wednesday morning, September 29 – October 1, will be our Interoperability Test Event, ending with lunch on Wednesday. Wednesday afternoon (beginning with lunch), Thursday, and Friday, October 1-3, will be the Calconnect Conference which will include both technical and topical discussions, briefings on what the CalConnect technical committees are doing, and discussions of problems, alternatives, and participation in the work of the Technical Committees.

Registration and Fees

You must register separately for the Interoperability Test Event and the CalConnect Conference. Please see Registration and Fees for more information and registration forms.

Special Registration Fee for This Event: $600 USD per person for first-time non-members to cover both the Interoperability Test Event and the CalConnect Conference.

We encourage you to register as soon as possible. Upon registration you will be invoiced for the amount due. However, you may choose to pay later, including at the event, if it is more convenient.

Conference Hotel

The conference hotel is The Caro Golf Hotel, and we are offered a special rate of €65 for a single and €75 for a double or twin, inclusive of breakfast, free wifi, and use of the hotel spa. In order to receive the special rate you must book using a form which is downloadable from the CalConnect XXXIII web page. You may also book online directly from the hotel, but you will not receive the special rate.


Who and What is CalConnect?

We are a collaboration between calendaring and scheduling vendors and users, established to further interoperability between calendaring and scheduling implementations, and work towards this purpose by driving the evolution of calendaring and scheduling standards through technical committee work, holding regular interoperability testing events, and hosting regular conferences, workshops and symposia focused on calendaring and scheduling. See our current member list at CalConnect Members. Learn more about CalConnect at our website and our blog. Find out about our previous meetings from our Event Reports and from posts on our blog. You can find out more about membership in CalConnect at CalConnect Membership.

What is CalConnect currently focused on?

You may find brief descriptions of the current work items of our Technical Committees at Current Work.

Questions and Feedback:

Please contact us at with questions or feedback.

In particular, if you are interested in the Interoperability Test event and would like to suggest specific areas of testing, or potential participants, we want to know. If you have specific areas of interest or topics which you would like to see addressed in the workshops and symposia, please let us know about that as well! Also, feel free to send this e-mail on to others who you feel might be interested, or contact us and ask us to invite them as well.

Please join us in Bucharest!


More Information:

More information about the test event, the technical conference, and the workshops may be found below. The schedule for the week may be viewed at CalConnect XXXIII Schedule (at this early date the schedule is an outline; we have not yet assigned time slots to specific sessions. This should happen in the next few weeks.) The entire set of logistics information, including travel, hotel booking, schedule, and as we get closer to the event, topical agendas and final topics for the workshops and symposia, may be viewed at CalConnect XXXIII.

Interoperability Testing

The Interoperability Testing will take place Monday and Tuesday, September 29-30, plus Wednesday morning October 1st. Our interoperability test events offer those with calendaring implementations a chance to test against others one-on-one; the event is structured to allow “testing pairs” where you will get a chance to test with everyone in the course of event.

The exact testing scenarios will be decided based on who is coming and what (and with whom) they want to test. Specific new testing areas include:

VTODO extensions for Tasks
Calendar extensions
EVENT encoding on web page (QRCODE)
Draft events
Server Information Document

Please see CalConnect XXXIII Interoperability Test Event for more information and a list of baseline testing areas (if at least two participants are interested in any of these areas we will do testing of that area).

CalConnect Conference

The CalConnect Conference offers a variety of sessions including topical and strategic discussions, technical discussions, a report on the Interoperability Testing, and a summary of the work done in each TC and identification of the work to be done in the next few months. The actual conference program is still being worked on and is not yet available; when it is, it will be posted on the CalConnect XXXIII schedule.

The conference will conclude no later than 18:00 on Friday, May 22.

Social Events:

There will be a dinner for all Interoperability Test Event participants on Monday Evening, a Reception on Wednesday evening for all participants in either the Test Event and/or the Conference, and a dinner for all Conference participants on Thursday evening. The social events are included in your registration fee.


Your registration to the Interoperability Test Event or the Conference includes lunch and morning and afternoon refreshments for the period of the event, plus the reception Wednesday evening. In addition, registration to the test event includes the Monday evening Test Event dinner, and registration to the technical conference includes the Thursday evening Conference dinner. Please note that breakfast is not included as it is generally included with your hotel package.

Observations from CalConnect XXXII in San Jose, California

CalConnect held its thirty-second Conference (XXXII) and Interoperability Test Event the week of January 26-30, 2015, hosted by Kerio Technologies in San Jose, California. This event was also the Tenth Anniversary of CalConnect’s first members meeting in January of 2005 at the University of Washington. The first day of the XXXII Conference was dedicated to the Tenth Anniversary Celebration, a look back at our first decade, and a look forward to the next decade of interoperable calendaring and scheduling.

The week led off with the Interoperability Test Even on Monday. The event had 24 participants from 14 organizations.

On Wednesday afternoon, we offered a special program for our Tenth Anniversary with 49 people in attendance, including twelve who came only for the celebration, plus 34 registered participants at CalConnect XXXII, which was held Thursday and Friday. We took this opportunity to leverage this milestone conference as a first step in reprogramming our conferences to be more engaging, more interactive, and more accessible to those not directly involved in the work or topic being presented. We augmented our traditional technical content with panel discussions, invited speakers, and special presentations, looking to transform attendees into active participants. Overall, the results of this initial effort were well received.

Here’s what’s trending from CalConnect XXXII:

Trending – Membership

Fastmail, based in Melbourne, Australia, joined CalConnect in December, bringing the 2014 new member total to 5. Fastmail is a hosted e-mail service which recently added an integrated calendaring service to their offerings.

Welcoming 2015, ZeeZide, based in Magdeburg, Germany, became our first new member of the new year. ZeeZide is a software development company interested in interoperability testing and standards.

Presently, over one third of CalConnect’s membership is international (not based in North America), including members in the U.K., several European countries, New Zealand, Australia, and Hong Kong.

Trending – Technical Committees and Provisional Committees (TCs and PCs)

  • TC-EVENTPUB will begin work on a proposal for QR codes for Calendar URIs.
  • TC-FREEBUSY has continued work on VPOLL and provided a live demonstration of three VPOLL-enabled (consensus scheduling) clients conducting a poll between three separate servers via iSchedule and VPOLL.
  • TC-SHARING has submitted its base specifications for WebDAV resource sharing and notifications (see below) and is beginning work on its calendar sharing specification.
  • TC-TASKS has submitted its Task Extensions to iCalendar and iCalendar Relations drafts (see below).

Trending – Interoperability Testing

The test event was extremely successful, with 24 participants from 14 organizations, including one non-member company. As always there was much testing of CalDAV features, including new and under development capabilities such as CalDAV PUSH, Calendar/ Contact Sharing and VPOLL. Unlike recent test events we saw a lot of iMIP testing including much testing against Microsoft Exchange. We also conducted BOF sessions on CalDAV PUSH, the possibility of QR codes for Calendar URIs, and a focus session on the CalDAV Tester Suite for new users. A more detailed accounting of the test event is available at CalConnect Interoperability Test Event Reports.

Trending – Special Events: CalConnect Tenth Anniversary Celebration

Wednesday afternoon was dedicated to a celebration of CalConnect’s Tenth Anniversary; our first real members’ meeting was held in January of 2005 at the University of Washington. We had a number of invited guests present in addition to the participants attending the regular CalConnect Conference, resulting in a fairly packed room of 46.

Special sessions for the Celebration included the History of CalConnect; The Freebusy
“Challenge”; Calendaring as a Platform; and a panel discussion on the Future of Calendaring. Additionally, we had two invited speakers: Lisa Dusseault, the original author of CalDAV, spoke on the trials and tribulations of committee standards development, and Steve Allen from the University of California Lick Observatory on “The Time People Want”, an exploration of the history of the measurement of time and time zones. Our special thanks to all our invited guests and speakers for making our Tenth Anniversary event so engaging.

Trending – Documents, Specifications and Standards

Much of the work in CalConnect is focused on specifications to be submitted as internet drafts to the IETF, with the goal of having them progressed to become RFCs; other work is published directly by CalConnect itself or submitted to other organizations.

CalConnect is currently working on seventeen specifications intended for the IETF. Of those seventeen, ten are currently at the IETF:

STATUS: AD review prior to IETF last call

Non-Gregorian Recurrence Rules in iCalendar
This document defines how non-Gregorian recurrence rules can be specified in iCalendar data.

STATUS: working group last call (TZDIST)

Time Zone Data Distribution Service
This document defines a time zone data distribution service that allows reliable, secure and fast delivery of time zone data to client systems such as calendaring and scheduling applications or operating systems.

Accepted by IETF Working Groups as WG Drafts

Calendar Availability
This document specifies a new iCalendar calendar component VAVAILABILITY that allows the publication of available and unavailable time periods associated with a calendar user. This component can be used in standard iCalendar free-busy lookups, including iTIP free-busy requests, to generate repeating blocks of available or busy time with exceptions as needed.

New Properties for iCalendar
This document defines a set of new properties for iCalendar data.

CalDAV: Time Zones by Reference
This document defines an extension to the CalDAV calendar access protocol to allow clients and servers to exchange iCalendar data without the need to send full time zone data.

Updated drafts already at IETF not yet adopted by a Working Group

Improved Support for iCalendar Relationships
This specification updates RELATED-TO and introduces new iCalendar properties LINK and RELATED-ID to allow better linking and grouping of iCalendar components and related data.

VPOLL: Consensus Scheduling Component for iCalendar
This specification introduces a new iCalendar component which allows for consensus scheduling, that is voting on a number of alternative meeting or task alternatives.

New submissions to the IETF

Task Extensions to iCalendar
This document defines extensions to the Internet Calendaring and Scheduling Core Object Specification (iCalendar) to provide improved status tracking, scheduling and specification of tasks.

WebDAV: User Notifications
This specification defines an extension to WebDAV that allows the server to provide notifications to users.

WebDAV Resource Sharing
This specification defines an extension to WebDAV that enables the sharing of resources between users on a WebDAV server.

Trending – Organizationally

Pamela Taylor, one of the original Directors of CalConnect and who served on the
Board of Directors until last year, and Dave Thewlis, the Executive Director of CalConnect who has also served on the Board of Directors from CalConnect’\’s inception, were honored with the CalConnect Distinguished Service Award.

Wrapping it all together

CalConnect wishes to again thank Kerio Technologies for helping to make CalConnect XXXII such a productive and enjoyable week, and to the organizations and individuals who participated in the event and in the Tenth Anniversary Celebration.

The next CalConnect event will take place May 18-22, 2015, in Bucharest, Romania, hosted by 1and1. We’ll be posting more information about this event going forward, and we invite you to join us and learn more about what we are doing — and participate in the work going forward.


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