I really like having interactive dinner parties where ill have lots if pizza dough easy and everyone makes their own pie. Topping choices are endless.
This was similar to what I was am suggesting. The interactive party theme can be done in a variety of ways, such as a progressive dinner, where each of your friends is invited to make a part of the meal, be it appetizer, main course, or dessert. Each portion is eaten at the home of the person who made it.
As for the kind of party suggested by Barryl.ashworth, pizza party is a good one, where everyone brings what they think will make the perfect pizza, and you supply the dough and oven.
Other party ideas include:
*Tamale party
*seafood party
*chili party
*pasta party (where each person is assigned to make a part of the total meal
*Pastie party
*pie party (can be savory or sweet)
*Cheese and fruits party
*Fondue party
*Racelette party
*Dolmas party
*cabbage rolls
*Egg Rolls
*taco party (each participant bring a different filling, i.e. shredded beef, carnie asada, seasoned ground beef, guacamole, sliced and shredded veggies, different cheeses, Mexican themed refreshment, etc.
*chocolate party (cakes, pies, confections, candies, drinks, etc.
That should be enough to keep everyone busy for a while, especially when added to the already amazing list you have been given by DC'ers.
Seeeeeeeya; Chief Longwind of the North