Well to answer your question I personally wouldn't take my young kids to such a thing. I think that in order to fully appreciate a Counterculture Festival of Euphoria, you first need to be old enough to understand the definition of Culture.
If I did absolutely need to go - we would attend the kid events.
If I felt a need to attend much after the early afternoon, I would get a babysitter. I think that the adults present at such an event have the right to Festival-Away without having to subject themselves to worry over whether or not their behavior might be inappropriate to the psyche of the occupants of my double stroller.