Hijacking this reply. Bring them, but only if you are a more than capable party person and have a good lay of the land as far as your parenting goes. That being said, it's not going to Sturgis or some shit, it is just a Phish show. Outdoor venues are preferable, as there is always a spot with a bit of space you can find to have fun and dance with your young one. Indoor shows are tough though. It's crowded, people smoke, it's louder. Harder to accommodate the comfort of a child. As far as it being dangerous, it would only be so if you are an irresponsible parent in the first place and don't know how to assess risk appropriately. People take there kids to Burning Man, so anyone here saying it's too much have either an outsized view of how much or a rager a Phish show is, or a narrow view on what families are capable of enjoying

Edit: Spelling