Funny you should mention that, as I just signed on to to my first event. I'm cooking for our neighborhood July 4th picnic: 120 adults/80 kids. Luckily, I'm in the convention hotel business so I have access to some outstanding chef's who are helping me calculate lbs, etc. If you've got some questions, I'll get you the answers.
Oh, and head on over to the Roll Call forum and introduce yourself. Lots of great ppl here to help you with anything 'smoking'.