2014-11-21 It seems I am a very special person for ... 5 years ago
It seems I am a very special person for google: the 'Birthdays' calendar which should be filled with the birthdays of all people in your google+ circles had the option to remove it from the list of calendars or unsubscribe totally. After being on the receiving end of some rants about this it is clear a lot of people don't have the option to get rid of this calendar. I found a possible workaround: How to delete the Birthdays Calendar from your Google Calendar. Update 2014-11-28: I was happy too early: now the calendar is back (without me asking for it) and I can't disable it normally.