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While in iCal: File>Restore iCal...

Select the most recent backup.

What? You didn't backup iCal? :eek:

You can try this

From the iCal File menu, choose Backup Database.
Quit iCal.
Navigate to ~/Library/Application Support/iCal/Sources.
Open each folder in the Sources folder and remove the file named "Index."
Open iCal; it will re-index your events.


...but I didn't find the iCal folder after a very brief search.
 
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