How to delete all ALERTS in iCal at once?

Question

Over the years I have added repeating Events with Alerts to iCal on various devices (some of them passed on to my relatives). As a  result I get plenty of Alert emails or sounds. I find it onerous to go through all repeating events to delete the alert. Hence my question: how to delete all Alerts at once?
Thanks for any suggestions/pointers/ideas. Cheers, Veit

Answer 1

Hi John,
Thanks so much for your help with this problem. I am trying to remove alerts for a couple of specific shared calendars (which I can edit) but am having some difficulty due to my inexperience with applescript! I am also not sure where else to go for help solving this problem.
My plan is to run your script a couple of times specifying one calendar at a time by name.
This is the modification I made to your script:
tell application "Calendar"
  activate
          delay 0.5
          display alert "Removing all alarms from your editable calendars" message "This process may take some time and is permanent. Are you sure you want to do this?" buttons {"Yes", "No"} cancel button 2
          set calname to "Consultant_on_call"
  --- repeat with myCalendar in (calendars whose writable is true)
          repeat with myCalendar in (calendars whose name is calname)
                    repeat with myEvent in events of myCalendar
  delete display alarms of myEvent
  delete mail alarms of myEvent
  delete sound alarms of myEvent
  delete open file alarms of myEvent
                    end repeat
          end repeat
          display alert "Removing all alarms from your editable calendars" message "This process is complete." buttons {"OK"} default button 1
end tell
Are you able to tell me what I am doing wrong? Thanks again.
Andrew