Girl, I am proud of you for stepping out of your comfort zone. Just keep yourself open to the experience, relishing it for whatevert it turns out to be.
Well, what do you like to make?
You could make something the night before, take it in a cooler then stick it in a crock pot or something to heat it up.
Chili, sloppy joes, italian beef all come to mind in the hearty foods category. Or you could bring some other part of the dinner like dessert (easy to transport) and a salad (no heating required).
I'll try to help more if you need something more specific.
If you are going to be "worried" about it could you call and ask what the provisions are for re-heating?
