Movie night concession stand- goes with outdoor movie screen. have guests bring pillows or lawn chairs for lounging at your outdoor/backyard movie theater! Rent an oldschool popcorn cart/maker or DIY popcorn balls to give away at your concession stand.
Great Fall Party Idea: Brown Bag Buffet: Pack snacks in plain brown paper bags at home. To serve, just roll down the tops of the bags and you've got serving "bowls" that can be thrown away at the end of the day.