Trust in your Training.
The hard work is done, the early mornings, the late nights and all the hard work is in the bank.
Adjust your calorific intake. Make wise food choices to match your training load. Eating a meal that’s 60 to 70 percent carbohydrates two nights before your event is preferable to a large carb load the day before. Drink normal before the event, do not pre-load electrolytes.
Perfect your race day strategy. Stick to a plan.
Make adjustable plans A, B, C and go over them before the race.
Write down hydration and nutrition plans and check your gear well before the race.
Embrace the free time.
Take in a movie, read a book, get a massage, go to a show, finish that project you started before you gave up your weekends for a long run. Distract your self with something not relative to running so you give your body a break and release some tension.
Rest and Recover, Rest is a part of training.
Give your body a chance to heal the muscles and repair. Sports massages are great on rest days.