Limit your menu to snacks that can be frozen or stored for later use.
If you prefer to provide a full buffet, keep in mind that most people who host graduation parties often complain that they had too much food left over. Limit the expensive items and stock up on non-perishable items that you can pull out if the food runs out.
Ask family and friends to make a food item for the buffet.
Share rentals with a friend or neighbor.
Share decorations with a friend or neighbor.
Instead of buying all new plants, borrow some from a good friend or neighbor.
Buy paper goods at a seasonal sale that corresponds with your school colors.
Graduate: Save time on gifts for your graduating friends by ordering everyone the same item