I cook at my own place, but it makes 100% sense to bring your gear with you. This is especially important if maybe they just don’t have something. Can’t really think of anything you’re missing! Eggs, maybe?
Generally speaking, do whatever you can the day before (or several dayd before, even). Most sides will reheat well. Pies and such can be made in advance. If you do something like sous vide turchetta, you only need to brown it/heat it before serving since it’s already cooked.