I'm sorry, there is no such page as event_calendar/group/1331/2013-09-07/event_calendar/group/event_calendar/group/1331/2013-09-07/event_calendar/group/1331.
No other page links to event_calendar/group/1331/2013-09-07/event_calendar/group/event_calendar/group/1331/2013-09-07/event_calendar/group/1331 yet.
Notice: 'event_calendar/group/1331/2013-09-07/event_calendar/group/event_calendar/group/1331/2013-09-07/event_calendar/group/1331': Bad page name: too long