One of the benefits of an open house is the informal presentation of food and beverages to guests. Guests come and go at different intervals, so have food available for guests to help themselves whenever they desire.
Mexican food is popular and can be adapted easily to serve at an open house. Serve tortilla chips, salsa and guacamole. Create a taco bar for guests to help themselves to. Offer both hard shell tacos and soft tortillas at one end of the table. Make up a large electric crock pot of ground meat seasoned with taco seasonings and keep it warm. Place assorted taco ingredients on the table, including refried beans, shredded cheese, shredded lettuce, diced onions, diced tomatoes, green chilies, diced hot peppers, and diced olives. Include condiments such as taco sauce and sour cream. Round out the food table with a large fruit platter or a fruit salad and your guests can help themselves to whatever appeals to them.
Italian food is also popular and can be served easily at an open house. Make up a few different pasta salads using Italian meats, vegetables, and Italian dressing. Create an antipasto tray using several different kinds of olives, plum tomatoes, roasted peppers, marinaded mushrooms, mozzarella cheese balls, grilled eggplant, and marinated artichoke hearts. Make a fruit tray with cut up fruits to complement the antipasto tray. Serve crusty French bread in bread baskets with dishes of sandwich spreads and dipping oils nearby. You could also serve sliced pizza on a platter, but you'll have to replenish the pizza as it is consumed by guests.
Down home American cooking is another way to feed guests at an open house. Make beef barbecue in an electric crock pot and keep it warm. Place a large basket of sandwich rolls near the barbecue. Chicken wings are also an option. Serve potato salad, coleslaw, pasta salad, fruit salad, a vegetable platter with dip, and plenty of chips and dip. Keep the salads cold by placing the serving bowls on top of larger bowls filled with ice cubes.
Don't forget to give the graduation cake a place of honor in the center of the table. Make sure that the cake is decorated with the graduate's school colors and add a few graduation cake decorations to the top of the cake. Cut the cake and place pieces onto cake plates so that guests can help themselves whenever they want.