You can't see it very well in the video, but there were numerous large screens set up at the festival.  A scroll for lost children rolled across the bottom when a lost child was found. 

One woman's child was in the "Lost Child" tent the entire three performances.  She probably figured, Meh, I know where he is....free babysitting, I get to see my name in lights, AND I'm not losing my place in the beer line!!  It's friggin loooong. 

I would wonder about the child of that woman.