Starting today when Google Calendar invitations are sent to members of a Google Group, the attendee list will automatically update as people join or leave the group. When you join a Google Group, you will be added to all of its meetings. And if you leave a group, those meetings will be removed from your calendar. Note that groups stop dynamically changing when the total number of guests in the event crosses 200.

Release track:
Scheduled Release

Editions included:
Google Apps for Business, Education, and Government

For more information:
http://googleenterprise.blogspot.com/2013/11/calendar-events-that-update-when-google.html
https://support.google.com/a/answer/172013

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