I'd add another brisket or at least a flat. And 3 butts. That will give the men about 6 oz of each meat and that is a good large serving that you say you want.
Sides - do you have anything to reheat pans in? If not then it's cold sides. You could reheat green beans casserole while pulling pork and slicing brisket. They will need to rest at least a hour before starting. Maybe even reheat baked taters. Or if you have a turkey fryer maybe do Onion Rings. Think outside the box.
Retired competition cook. BBQ mentor.