I'd go for the chili or the stew idea if I were you. "Pub" style food would be hard unless your talking putting together some reubens or ham and cheese sandwiches and grilling them in the pan. With that many people you'd be cooking for awhile.
What about kielbasa or brats cooked in a vat of beer, onions, and butter? Get some brat mustard and sauerkraut. A couple bags of these specialty chips they make now - I just had the Kettle brand salt and black pepper and boy were they good. They were salt forward with a nice pepper finish. You could make potato salad or something else ahead of time and just have it ready to go. Even if you pre-made wings you could heat them back up on the grill itself.
Maybe this will give you a few ideas to get started with anyway. Sounds like a fun trip - maybe you should hire a few waitresses to cook for you guys!!!!