One of the better evenings in the back yard I've had involved the guests building their own dinner. I did beef chuck roast and turkey breast in the smoker, pulled them off the cooker, sliced thinly and stacked on platters.
The tables were laid out with corn and flour tortillas, pitas, crusty rolls, burger buns. Lots of lettuce, tomatoes - diced and sliced, sprouts, sour cream, salsa, various onions, pickles, olives. Sliced and grated cheeses. Several types of homemade mayo, like lime and chipotle, ginger - chili - sesame oil, lemon - tarragon, your basic yellow mustard, some kicked up horseradish types, etc.
Basically it was an array of stuff to make whatever wrap, burrito, sandwich, taco, ...
Folks made what they liked, nobody went home hungry. That was a good party!