It depends on what kind of cooking you like to do.
I have a wonderful recipe for mini hamburgers with fresh tomato sliced stewed over them, served over rice. I've served that at parties.
For a tasty chicken dish, line a rectangle glass pyrex with raw chicken thighs (they are inexpensive). Sprinkle worcestershire sauce, soy sauce, 1/2 cup of water, garlic salt and ground black pepper over the top. Bake in a 400 degree over for 1 hour.
A large roast beef is easy to bake if you are going for something more elegant. Place in roasting pan. Season with garlic salt and ground black pepper, or whatever other herbs you like to use.
Pasta dishes are a great way to serve a lot of guests.
Meatballs also always go over well!
Toasted sandwiches are also easy for a finger food.
Casseroles are also great! (One simple one we make, I'm not sure it's appropriate for your gathering, is ground turkey browned in a frying pan. Mix with cream of mushroom or chicken soup, and a family size can of green beans. Add to a square or round pyrex and place tator tots on top. Bake for 350 for 30 minutes. ... Just triple the recipe for 8 people.)