We often have a salad bar for groups that size. You could grill a couple of chicken breasts and cut them into bite sized pieces, then put them on a platter with small bowls of beans, sunflower seed kernels, 'shrooms, olives, tomatoes, cukes, craisins, boiled egg, shredded cheese, croutons, onion slices, bell pepper, mandarin oranges and whatever else you think folks might want. Provide a couple of dressing choices, we usually offer ranch, catalina and my house vinaigrette and a HUGE bowl of salad greens. Usually a big hit!