Okay heres my input- come dine with me style! :-
1. Daredevil- it would be interesting to see how he copes eating etc- plus he could be the cook- smelling when the food is properly cooked etc and he would be good with flavours n spices due to his heightened senses.
2. Shazam/ Captain marvel- You could get him drunk then shout shazam so you have a drunk billy batson puking everywhere!
3. Madrox the multiple man- he could be dinner guest and also bouncer, waiter, n firework display artist....
4. Zatanna- magic tricks and well just a bit of hot totty for the night!
5. Punisher- the grumpy one- see how long it takes him to get peed off and kill someone- he could always kill off a duplicate madrox I guess-wont matter as much!!
so, go ahead- whats your idea of a super hero dinner party??