THE PERFECT POTLUCK DISH FITS CERTAIN GUIDELINES:
1) It travels well. If it won't make it through an hour on the passenger seat of your car while you swerve through summer traffic, it doesn't make the cut.
2) It can be stored and served at room temperature. Heating it up when you get to the party is too much of an imposition on your host. And, refrigerator space is limited and, frankly, better used for beer.
3) It doesn't take long to make. You have a party to get to.