CalConnect XXXIX - June 12-16, 2017

CalConnect Interoperability Test Event and Developers Forum - Monday-Wednesday
Public Workshop Introduction to Calendaring and to Scheduling - Wednesday afternoon
CalConnect Conference - Wednesday-Friday

Seattle, WA
CalConnect XXXIX in Seattle, June 12-16 2017, Hosted by Tandem
Monday, June 12, 2017 to Friday, June 16, 2017
Subscribe to the CalConnect Week Calendar.
Recent Changes: 

2017-02-21 Dates of event changed to June 12-16 2017

2017-03-31 Logistics information about venue, hotels, travel, etc. added along with preliminary agendas and schedules.

2017-05-04 Developers Forum/Test Event topics and testing areas added

2017-05-04 Conference Schedule and sessions added.

2017-05-11 Information about the public workshop on Introduction to Calendaring and to Scheduling added

2017-05-26 Session on IETF processes review and CalConnect added Thursday afternoon

2017-06-05 CalConnect Schedule available for subscription

2017-06-13 Subscription link to CalConnect week calendar corrected

Hosted by Tandem, Seattle, Washington

CalConnect XXXIX, consisting of a CalConnect Interoperability Test Event and Developers Forum, and a CalConnect Conference, will be held in Seattle, Washington, California, on June 12-16 13-17, 2017, hosted by Tandem.

Developers' Forum and Interoperability Test Event: The Developers' Forums and Test Events are open to both members and non-members as participants or as observers; please see Test Event for basic  information about the event and for the schedule and agenda  (this will be developed gradually, so check back periodically).

Please Note: You do not need finished or polished code to participate in the testing; in fact as soon as you have something working at all, testing against other participants can help debugging and code development, especially in identifying red herrings and wrong decisions.

Public Workshop: A public workshop, Introduction to Calendaring and to Scheduling, Wednesday afternoon 14 June from 14:00 to 18:00.

Conference: The Conference will offer a variety of sessions on technical and higher-level topics, informal BOFs (Birds of a Feather sessions), plus additional sessions and committee meetings. All attending member representatives and observers are welcome.

The last session on Friday afternoon will be the full Plenary meeting of the Consortium, open to all participants. This session will include future directions for Technical Committees, and establishment of future goals and directions for the Consortium.

International Visitors 

International visitors who are not U.S. Citizens or hold a valid U.S. passport should acquaint themselves with any changes in U.S. travel and visitor policy since their last visit to the U.S. at Attendees who require a Letter of Invitation to obtain a visa should contact Dave Thewlis, CalConnect Executive Director, at Please be aware that you must have registered for the event before a Letter of Invitation can be issued.

Conference Details 

Morning coffee and continental breakfast, lunch, and morning and afternoon breaks will be served to all participants in the Developers' Forum and Conference and are included in your registration fees. The Monday and Thursday group dinners are hosted by CalConnect. The Wednesday Reception is hosted by Tandem, our hosts for CalConnect XXXIX.

Dress at all CalConnect events is casual to business casual.

Registration Information 

Please see Registration and Payment Options to choose your registration type and payment option for the CalConnect Conference and/or the CalConnect Interoperability Test Event and Developers Forum. Note that you must register separately for the Conference and for the Test Event, but you may request a combined invoice. You may register at any time for the next event.


CalConnect XXXIX will be held at Galvanize Pioneer Square, 111 S. Jackson Street at First Avenue, Seattle, Washington 98104, in the Pioneer Square district of Seattle.  We will be in the main conference room on the fiifth floor, next to the elevator.

The closest Light Rail Station is International/Chinatown Bay C, a short walk down S. Jackson Street to the venue.  Here is a map of the immediate area of the venue showing the light rail station.  The venue is about 8 blocks from the Conference Hotel, the Kimpton Alexis Seattle, at 1007 First Avenue at Madison.


Seattle is served by the Seattle-Tacoma International Airport, generally called SeaTac.  SeaTac is about 20 miles south of Seattle, and offers both public transportation and rental cars.   (We do not recommend a rental car unless you must, due to the high cost of parking in downtown Seattle.)

The easiest way to get from SeaTac to downtown Seattle is the Seattle Light Rail system.  As noted under Location, the nearest Light Rail station to the venue is International District/Chinatown Bay C.  The nearest Light Rail station to the conference hotel is the Pioneer Square Station or University Street Station, the next two stations north.  The journey takes about 40 minutes and the cost is less than $4 U.S.  Trains run every 6-15 minutes depending on time of day, and are available from 5 a.m. until midnight or later. 


Lodging costs in Seattle for the period of the event, June 12-16, are quite high, probably because of the tourist season.  We have managed to identify a conference hotel; however the CalConnect rate will depend on availability.  We encourage you to book your room as soon as possible.  

The conference hotel is the Kimpton Alexis Seattle, at 1007 First Avenue at Madison, about half a mile from the venue.  The nearest Light Rail stations to the hotel are the Pioneer Square station and the University Street station, one and two stops north of the International District/Chinatown Bay C station

The Kimpton has offered us a group rate of $275 per night for those willing to commit to their stay to us, such that CalConnect will guarantee the room costs.  In order to secure this offer we had to commit at the beginning of April following a quick notification to possible attendees.  The Kimpton has offered to make this rate available to other CalConnect attendees as long as availability permits.

The least expensive hotel in the area of the venue appears to be the Best Western Plus Pioneer Square, which is quoting a best rate of $289 per night for the days of our event (slightly less for AAA/CAA or Senior).   

AirBnB is certainly an alternative especially in the Capitol Hill Light Rail station area, a few stops north of Pioneer Square. Additionally, lower rates may be available very close to CalConnect week if hotels still have vacancies, but have backup plans.



Test Event Schedule 

The Developers Forum and Interoperability Test Event begins at 0800 Monday morning and runs all day Monday and Tuesday, plus Wednesday morning.


Monday 12 June
0800-0830 Coffee & Rolls
0830-1030 Testing/Forum
1030-1100 Break and Refreshments
1100-1230 Testing/Forum
1230-1330 Lunch
1330-1530 Testing/Forum
1530-1600 Break and Refreshments
1600-1800 Testing/Forum

1915-2100 Test Event Dinner (TBA)

Tuesday 13 June
0800-0830 Coffee & Rolls
0830-1030 Testing/Forum
1030-1100 Break and Refreshments
1030-1230 Testing/Forum
1230-1330 Lunch
1330-1530 Testing/Forum
1530-1600 Break and Refreshments
1600-1800 Testing/Forum

Wednesday 14 June
0800-0830 Coffee & Rolls
0830-1000 Testing/Forum
1030-1100 Break and Refreshments
1130-1130 Testing/Forum
1130-1200 Wrap-up
1200 End of IOP Testing

1230-1330 Lunch


Test Event Agenda 

Forum Program for Seattle

  • Ensure TC-API work covers all current specs and drafts
  • Possible ical4j discussions
  • Further work on tester
  • Subscription upgrade
  • Review testing resources on website and clean out junk or supply current links

Specific Areas for testing as identified by participants

Specific testing areas will be requested by registrants Probable areas include
  • Server returning VPATCH
  • Sharing
  • CalDAV
  • CardDAV
  • iMIP
  • ical4j
  • Calendar publication and subscription models
  • TESTER (extended CalDAV Tester)
  • DAV server discovery
  • JCAL
  • XCAL

Please see the Reading List for the Developer's Forum at

Baseline Testing

Final determination of what will be tested will depend on what the participants in the test event wish to test; the current set of interests is noted above. Participants may also request to test things that are not mentioned in this list (the registration form offers a place to indicate areas you wish to test). In all cases at least two participating organizations must be interested in testing a particular area or scenario to form testing pairs.

Please note that you do not need finished or polished code to participate in the testing; in fact as soon as you have something working at all, testing against other participants can help debugging and code development, especially in identifying red herrings and wrong decisions.

Possible Testing areas

  • CalDAV testing:
    • Access (basic operations of CalDAV)
    • Scheduling
    • Sync report (depth: 1 on home collection)
    • Mobile
    • Sharing
    • Prefer Header
  • Managed Attachments
  • iSchedule:
    • Server discovery
    • DKIM security
  • Timezones:
    • Service Protocol
    • Timezones by Reference
  • Calendar Alarms:
    • Snooze
    • Default alarms
  • VPOLL support in clients and servers
  • VAVAILABILITY support in clients and servers
  • Autodiscovery protocol
  • Non-gregorian calendar recurrences via RRULE and RSCALE
  • iCalendar:
    • Rich text and other new properties (and hashing)
  • iMIP
  • iTIP
  • jCal, the JSON format for iCalendar - libraries and servers
  • xCal, the XML format for iCalendar
  • Enhanced VTODO support
  • CardDAV testing:
    • Generic
    • Sync report
    • Mobile
    • vCard 4

Who May Participate or Observe

Any vendor or organization wishing to test a calendaring and scheduling implementation, or a mobile calendaring server or client, is welcome to participate whether or not they are a CalConnect member. Note that non-members pay a 25% surchange on the Interoperability Test Event registration fee.

Any vendor or organization wishing to observe the Interoperability Test Event is welcome whether or not they are a CalConnect. Note that an organization, member or not, may only observe one Test Event. 


Please see CalConnect Interoperability Test Event Registration Fees for information about event registration fees. Please choose one of the following registration methods:

Interoperability Event Scenarios

If you are planning to participate, please contact us to let us know which interoperability event scenarios you wish to pursue or if you would like to propose a new scenario.

CalConnect will invite all registered participants to two or three conference calls prior to the event to discuss logistics, testing scenarios, etc.

Conference Schedule 


Wednesday 14 June
1100-1200 Introduction to CalConnect Q&A
An optional session for first-time attendees. The genesis of CalConnect, a brief history, how CalConnect works, followed by questions.
1230-1330 Lunch
1330-1400 Opening and Introductions
Welcome, Logistics, Introductions
1400-1530 Public Workshop - Introduction to Calendaring and to Scheduling
Please see Public Workshop at CalConnect XXXIX for details.
1530-1600 Break and Refreshments
1600-1800 Public Workshop (continued)  
1800-2000 Welcome Reception
On premises
Thursday 15 June
0800-0830 Coffee & Rolls
 0830-0915 CalConnect Conference Opening
Welcome, logistics, test event report, Liaison reports, review of conference schedule, introductions.
0915-1000 Host Presentation (Tandem)
1000-1030 Enhanced Synchronization and Update
Mechanisms to pass smaller packets of data using new iCalendar constructs
1030-1100 Break and refreshments
1100-1130 VALARM Extensions
Review and progress on alarm acknowledgement/snoozing, proximity-based alarms, new alarm action(s), defaut alarms
1130-1200 DAV PUSH Overview and Status
Standardized notification and push mechanism for DAV
1200-1230 Calendar Subscription Upgrades
Provisions to allow a server to advertise more efficient forms of subscription, and enhancements to HTTP GET for simple synchronization.
1230-1330 Lunch
1330-1430 New JSON Representation for Calendar Data
TC API status and issues; support for VCARD, VTODO, categories.
1430-1500 Calendar Developers Guide (DEVGUIDE)
Implementation and additions to the Developers Guide, discussion of future additions.
1500-1530 IETF and CalConnect
Review of IETF processes and how CalConnect relates to them.
1530-1600 Break and refreshments
1600-1700 VCARD, TC 211 and ISO 19160
Representing non-western address formats in VCARDs, collaboration with ISO TC 211, synchronization with ISO 19160.
1700-1730 Security concerns for calendar and contact data
Safely validating source of events and VCARDs in QRCODEs, etc.
1730-1800 CalConnect iCal4J
Proposed future developments for iCal4J, direction towards a common CalConnect implementation.
1915-2130 Conference Dinner
Friday 16 June
0800-0830 Coffee & Rolls
0830-0930 Categorization and event types
Being able to categorize events in a standardized manner will help in aggregation and allow applications to discover events of interest.
0930-1030 Calendaring extensions for improved grouping of properties
PARTICIPANT and ATTENDEE in event publication and scheduling.
1030-1100 Break and refreshments
1100-1130 Calendar Spam Update and M3AAWG
1130-1200 Status of issues from CalConnect XXXVIII
Status and discussion
1200-1230 Future Areas of Engagement for CalConnect
(Internet of Things, Health Care, Travel, etc.)
1230-1330 Lunch
1330-1400 Future Areas of Engagement (continued)
1400-1430 CalConnect CalDAV Tester
Working towards a certification suite for CalDAV servers
1430-1445 Technical Committee Directions for period to CalConnect XL
1445-1530 CalConnect Plenary Meeting
Administrative business, coming events, consensus agreements on decisions reached during the week, open floor.
1530 Close of CalConnect XXXIX


Please see the Reading List for the Conference at