You need to tweak the menu a bit, so the non-meat eaters have something to enjoy

Pulled pork 20 pounds ready to eat

Hot Dogs- about 80, don't open all until you see how its going
Hamburgers- about 40
If you are not attached to grilling, consider some roast chicken instead- easier- about 28 quarters

Mac & cheese- 8 pounds dry

Potato salad- 20 pounds potatoes

Pasta salad (tomatoes, peppers, pepperoni, onions, bow ties)
Macaroni salad (with tuna)
Do 6 pounds dry, divide as you wish, leave the meat out of one. With the mac and cheese, I would probably omit the mac salad...

Cole slaw- 2 1/2 gallons