I'm trying to clean up multiple occurences of past events by changing the "Calendar" of one occurence then deleting those with the previous calendar.
If I do this for a repeating event in iCal (Lion 10.7.5), the last occurence does not appear. If I do this for an event on Calendar on my iPad (iOS 6.1), the last occurence appears. When I sync the calendars via iTunes, the event changed on my iPad loses its last occurence on my Mac.
My cheap workaround is to give an event an extra day for the end of the repeat.
Or the alternative seems to be to create a new event entirely on either device, that seems to work.
The problem may be that these old events were created with Outlook 2011, which in turn may have been responsible for all the multiple events