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calendars.txt
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Unfortunately iCal does not have built-in Time Machine GUI support (like iPhoto or Mail has).
Where you can invoke  Time Machine from within the program and then go back in time.


However, you can go to the place in the Finder where your iCal calendars are stored.
This will allow you to go back in time to grab a previous version of the calendars.

The calendars are located in ~/Library/Calendars/.
 I'd recommend recovering the whole "Calendars" folder from a previous time,
 rather than the individual calendars because the calendars are rather cryptic in their names.

iCal resources are located in several locations. 
They are:

~/Library/Application Support/iCal/
~/Library/Calendars/
~/Library/Preferences/com.apple.iCal.plist
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How to Restore your Mac With a Time Machine Backup:

http://www.ehow.com/how_5107613_restore-mac-time-machine-backup.html
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