How come?
I was thinking more along the lines of cookies and some sorta pasta salad from the deli. Maybe. It’s likely to be a long, warm drive down, even with the A/C on.
Chips and salsa are a great choice. That's just usually why 90% of the people who forgot to make something bring them.
On a hot day, I don’t think you can have too many cold fruit salads and things, but I’d avoid stuff with mayo in it, just so you don’t end up killing somebody.