Depends on what time of day your event is.
Definitely eat breakfast to boost metabolism . Here are some choices: Instant Oatmeal with skim of low fat milk. Toast with all natural almond or peanut butter, Dry cereal, yogurt and fruit are all light options that will rev up the body. If you are competing in the morning, be sure to keep it light . Op for a heavier breakfast if your competition is in the afternoon.
Pack a variety of food options. Fruit, vegetables, grain and high quality protein sources should cover the variable appetite, and stomach tolerance you may experience on race day.
Pack in the protein . It will ally in keeping your blood sugar stable. Nibble on cheese sticks,or slices, nuts, deli meats yogurt hummus, hard boiled eggs.
Don’t forget the Carbs: Muscles rely on them for fuel.
Pack easily digestible sources such as 100% juice, applesauce, fresh or dried fruit, or veggie sticks. Complex carbs such as crackers, unsweetened dry cereal, pita or other breads, pretzels and graham crackers
Stay away from refined sugar such as soda, candy and desserts on race day.
Save “meals” or large quantities of food For BIG breaks between events .
Hope this helps.
Nibble small amounts of food before and after events that are closely scheduled