We read the book in 10 weeks and will have 11 webinars/teleconferences. The webinars/teleconference will be held weekly on Monday’s at 16:00 CET (Amsterdam timezone).
There is a public calendar with all the events that relate to the reading group (including a schedule for when to read what chapter). You can subscribe to this calendar with XML or iCAL.
The meetings/webinars are held with a tool called Adobe Connect. There is help available here if you are struggling to connect or how to use it.
The most recent version of the plan outlining when to read what and who should summarize is available here.
Understanding Media 
If someone else also had a question regarding what is Adobe Connect and what am I supposed to do to join the meeting, I found this video to be helpful: http://tv.adobe.com/watch/learn-adobe-connect/attending-a-meeting/