need help planning party menu!!

i'm throwing a surprise party for my dh and have about 20 adults and somewhere around 6 kiddos coming.

my family eats everything as do a few others but we have a majority of vegetarians and several vegans in there, too.

i'm asking some people to bring their specialty dishes for apps and desserts but for the main meal i'm stumped. all i've got on the list so far is corn on the cob! i guess a big old salad will be good. but what else? it is jaime's bday and i would love to do a big clam bake since he would LOVE it but i don't even know where to start with that and then what food for all the veggies?

this is a whole weekend affair starting friday night with everyone camping in the backyard (we live in the woods) and everyone is doing their own thing for all the rest of the meals. so i'll have help for all the prep and cooking but i'm just stuck on what to make!

any ideas esp from veggie folk would be appreciated!!