I would choose something I could cook in a crockpot.
You could have your ingredients ready before you left home,
then put them on to cook that day, with very little fuss.
As a word of caution ...... when moving food around, please consider food safety.
Remember, that hot foods are to be kept hot, and cold foods kept cold.
Meeting in the middle with warm or not cold, can all too easily be an invitation to
what none of you want to get as a memory from a joyous get together.