There is a right way and a wrong way to cook at a music festival. The first thing you need to do is decide if you are going to just take care of yourself (solo) or if your group of friends will be eating together. I will break down both options for you.
Solo: If you are going to just be taking care of yourself your food strategy should be to bring easy meals to eat for breakfast and lunch. Then you should just bring $10 a day to pay for a warm meal from one of the food vendors. Here is a list of items you should consider bringing with you. All of these items do not need to be cooled and can be eaten instantly without needing to be heated up.
Shopping list: granola bars, trail mix, muffins, apples/bananas, protein shake (1 per day), banana bread, nutella with tortillas, premade pb+j.
Group cooking: If you are going with a group of people and you have decided that you are all going to cook together then you should divide your group into teams. Then divide the meals each day among the teams and you will find yourself really well fed during your festival weekend. Also make it known that the team that is not cooking is on dish duty.
Here is a list of items you will need to be prepared for the weekend.
-Gas grill and ample propane.
-2 containers for washing dishes. One for washing with soap, one for rinsing the dishes off.
-1 plastic plate, bowl, cup, fork, knife, spoon, for each person camping with you.
-1 cutting board.
-Coolers that you need to keep filled with ice.
-1 table for cooking on.
-Pots and pans depending on your menu.
Here is a list of easy food items.
-Tortillas with Nutella
-Egg whites from a carton.
-Coffee made from coffee extract.
-Premade tuna or chicken salad wraps with tortillas.
-Cold noodle dish. (This is a great festival food)
-BBQ chicken or pork sandwhich
-Bring food that travels well.
-Split the cost of ice with your crew.
-Leave your campsite cleaner than you found it.
-Share with your neighbors.
-Use reusable products
-Bring a large container of water and refill it.
-Use paper plates and plastic silverware.
-Bring bottles of water.
-Bring food items that do not travel well.
-Let your food spoil.
The main idea is to have dishes that just require you to heat them up and they are ready to go. The less work it is, the bigger the chance that you will make it. The more prepared you are to eat well during the festival, the more fun you will have.