Download iCal Cleaner from BusyMac
From BusyMac: “Over time, iCal can become filled with all kinds of bogus data like duplicate events, blank events, duplicate alarms and more. All of this extra baggage adds up and can make iCal sluggish.”
iCal Cleaner is a free utility from our friends at BusyMac, designed to clean up common problems in iCal. Just launch iCal Cleaner, select the calendars you want to clean and the action you want to perform, and click Start.
Special thanks to the folks at BusyMac for a great app.
Also, for something a bit more robust, you might try Spanning Sync’s Calendar Cleaner.
