Portable iCal

Portable iCal.app is a shell script that open local copy of iCal™ using preferences stored in its application bundle.

~/Library/Application Support/iCal and ~/Library/Caches/iCal folders and ~/Library/Preferences/com.apple.iCal.plist, com.apple.iCal.AlarmScheduler.plist and com.apple.iCal.helper.plist files are temporary renamed with .pabu extension and a symlink is created to use portable ones.