Use the guest of honor's high school colors to decorate the location of your graduation party. Cover the tables with nice tablecloths and fill scalloped white serving trays with the food. Stack paper napkins near the buffet.
Set out pitchers of water and pomegranate soda. Sprinkle graduation hat confetti on the tables and tie several metallic balloons to the mailbox or front door. Place vases filled with fresh flowers in between the serving platters.
If you have any sporty games, like ping pong or shuffleboard, bring out the supplies and get everyone involved in a tournament.