This guy was a character. He seems like a dude who really, REALLY enjoyed the 70s and never left. He told me that he just loved being at the REN Fest and spends as much time there as possible. He also said that he had a store there (where this pic was taken) but I didn't actually understand what he sold.
I imagine him partying with a bunch of younger kids, sitting around by a fire at night, where everyone is drinking and having a good time. They enjoy his company because he's a nice guy and probably has a lot of good stories to share too. Also, he has a bottle of LOKI hidden there somewhere too :D