The thing about a potluck or "pitch in" is that you never really do know who will bring what, and that is sort of the fun of it.
I once had a potluck brunch at my house for 10 or so women. Being the hostess I had made an egg casserole dish, but every other woman brought muffins. So we had 9 kinds of muffins and my egg dish. We just laughed and ate it all, it was sort of funny. The real fun was in the companionship, not what we ate.
My advice is to bring something that YOU like, that way you know you won't go hungry if everyone else shows up with something funky like spam salad sandwiches or tofu brownies.
