preliminary thoughts re ICal

[will lomas]

        Hi

From reading anne's informative article about ICal, I see you can set  
an alarm to go off. But can you I wonder, set it say 30 minutes or so  
before an event.
Say for example this evening. I am going out for a birthday  
celebration as it is one of my relatives 21st wish it was mine, smile.
We are leaving around half seven. It would be good if I could state:  
ok appointment is half seven to iCal, but please remind me say half  
hour before with a message saying get ready for party or something  
similar?
wil