When I host, I often assign chores or peripherals. "Uncle Joe, that's great! Can I put you in charge of the coffee? Aunt Frieda is in charge of the bar, and Richard's watching the relish trays, so if you could bring coffee and coffee cream, and take care of seeing the pot's always full, that would be perfect!" I find people love assignments. They are active participants in the party, and it seems like fun for all. Peripherals, for me, include green salad, nuts and chips, somebody's special dessert, "whatever you'd like to drink" and I will start including various games and maybe a family-friendly film for those so inclined. Great idea!