Use the ear plugs and bring on the youngin'!!!
We're watching several Little Festivarians growing from year to year and we love it so much! There's no better place to start a family tradition either!
If I still had little ones I would get them started drinking more water running up to festival time and make sure bananas are in the diet so potassium levels stay up at elevation. Bring plenty of layers to keep them bundled during the cold nights. Baby sunscreen and big floppy baby hats for protection from the sun during the day is a must along with two cozy blankets, one to take a nap on and the other to provide shade (hung from festival chair to festival chair with a few clothes pins)
Try and remember they are on vacation also and have a great time!
Auntie Hope