I don't think the major will ask this question.
Well, the outdoor buffet should be heated, the food is safe, the transportation is convenient, and you can eat it by hand (there must be no table)
Drinks
If yes, choose large bottles of drinks (carbonic acid, water, fruit juice) and pour them on site or in advance (disposable cups). If you must drink a hot drink, put it in a thermos. But it is inconvenient. For the sake of the elderly and children, it is still necessary to arrange people to fall.
theme
It is inconvenient for rice to need side dishes. It tastes bad when it's cold. Not recommended.
You can consider bread, cake (without cream, cream will come loose easily) and pasta. Pasta is actually very good. Cold noodles in summer or something. Remember to oil it. Otherwise it will stick.
vegetables
Prepackaged foods is convenient and sanitary. Sausage, lunch meat, canned fish, roast duck, boiled chicken, fried chicken pieces and bacon can all be prepared or bought to take away.
Get more vegetables, you can make vegetable salad, potato salad, fried peas, beans, cabbage and other foods that don't change color and become soft for a long time. If you have some ideas, get some kale or something better.
fruit
Don't bring bananas, bananas rot easily. Don't bring apples, they will change color. Watermelons, cantaloupes and pears sliced in advance are all very good. Or longan, litchi and orange with skin are also good. Several horizontal plates are making a big fruit salad. Perfect.
Playing so much with pure hands. Give points:)