Finding and deleting permanent events

I recently bought a Sky Calendar and synched it with my iCal. At one time, I had several recurring events in my iCal. I deleted them from calendars but, when I synched my Sky Calendar to my iCal, these events reappeared and I can't get rid of them. I thought they may be in iCloud but, when I view iCloud Calendars, I don't see them. Does anyone have any idea where these could be coming from and, more importantly, how to get rid of them? Thanks.