Ashley,
Might I suggest a rigatoni (PENNE)w/ sauce & meatballs. You can get the noodles @ Sam's Club or Costco in bulk. One 5lb. bag goes a long way. It will fill up a large electric convection oven. You should allow 1-2 meatballs per person. Chicken francais or jerk chicken is easy & cheap. Parsley potatoes You can get them in the can @ Sam's or Costco. Drain & cut the potatoes in quarters. Deep fry them until slightly golden brown. Drain and season. Melt buter and drizzle over them. 4 cans will serve @ least 100-150 people. Green beans in the can from the same place is economical too. I hope that this helps Best wishes to you!