If I try to delete an event on iCal, it offers me these options:
- Delete and Notify
What if I want to delete without notifying?
I'm running iCal 5.0.2 on OS X 10.7.3 using an Exchange account.
Edit: Using an Exchange account.
You can move the event to a local calendar. When deleting you will then get the additional option "Delete & do not notify".
A couple of years ago I wrote a script to do this. It's all at http://thefragens.com/blog/2010/04/dont-send-ical-replies/
The gist of it is the script will automatically alter an AppleScript inside the iCal package. It does not effect the code signing. The script also has a method of reverting itself. You'll likely have to install the changes each time iCal is updated.
NB: It won't work with Exchange accounts.
The zip file has the install bash script, a modified and an unmodified AppleScript.