Anyone can attend Firefly, but those under 18 must be accompanied by an adult. The accompanying adult can be a relative, friend, or guardian age 18 or older and must have a festival pass.
Children 8 and under can accompany adults to the GA area of the festival and children 2 and under to the VIP area, free of charge (no pass required). They may ask for proof of age upon arrival. We recommend bringing a photocopy of your child's birth certificate or their passport if they have one. You could be asked for it at anytime so make sure it's handy.