I agree with Pam. Fund raising campaigns are all about inviting the right Sims — Sims who are very close friends and Sims that are rich (ideally a few of them would be both). If most of the Sims invited fit the bill, then they're going to have a great time regardless. Party Animal trait is overboard. Just Feed 'em. Talk to 'em. Hold out your hand at the end and kick 'em out the door. "Thanks for coming. Oh, Nancy Landgrab, this is so generous of you."