Grab whatever fruit is cheap and make a crumble. Quick, easy, cheap.
Fresh fruit for 20 this time of year gets expensive in a hurry.
But I just found out where we're going will have an extra 7 last minute guests. I'm in charge of dessert and only did 3 pies. I have a whole pile of apples in the kitchen. Good idea.
Another thing I do sometimes at the last minute is some kind of cake (I always keep a mix in the cupboard for emergencies) and instead of cooling completely and frosting, dust it with powdered sugar and bring that cool whip.