iCal is frozen in ...upgrading calendars
I can not quit Calendar
iMac
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Alex,
You do not indicate which version of OS X you are using, so the following instructions are provided considering that you are using one of the most recent versions.
From the Menu, select Force Quit...>Calendar.
Paste this text ~/Library into the Finder>Go>Go to Folder...window and select "Go." This will open the Users Library Folder.
Then open the Preferences Folder in that Library Folder, and move the com.apple.iCal.plist file to the Desktop.
Log out/in or restart, and open Calendar to update.