Ah great, I think he would love it but you never know with littles.
I've done latitude (whilst heavily pregnant) and a covers band festival..both great, really fun. Obvs hard work compared to normal but I'd recommend just doing it 😁
I’ve not done that festival but we took our little girl to Kendal Calling a couple of summers ago. They have a Kids Calling area and she loved it. There were lots of children there being pulled around in camping trolleys. I would think if 2000 Trees is family friendly it would be similar