Adding alarm to iCal event

I export data from Mr. Tides to iCal. I would like to add alarms to two
kinds of events. iCal's dictionary suggests this is possible, but when I
ask for an event's properties, there is nothing about alarms. The
following script fails with the error messages indicated in -- comments.

I'm trying to do this script under Leopard, and I'm wondering if this is
yet another example of half-baked scriptability in this new Mac OS.

tell application "iCal"
 activate
 tell calendar "Port Orford Tides"
  set sunriseEvents to events whose summary contains "Sunrise"
  repeat with thisEvent in sunriseEvents
   tell thisEvent
    make new open file alarm with properties
{filepath:"/Applications/Mail.app", trigger interval:-30}
    -- "iCal got an error: AppleEvent handler failed."
   end tell
  end repeat
  set sunsetEvents to events whose summary contains "Sunset"
  repeat with thisEvent in sunsetEvents
   tell thisEvent
    make new sound alarm with properties {sound name:"Basso", trigger
interval:30}
    -- "iCal got an error: AppleEvent handler failed."
   end tell
  end repeat
 end tell
end tell
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