The SCA is probably the closest thing. Its world wide, breaks down into kingdoms, baronies, shires, etc. Every group has a leader than in turn answers to the next tier up. And I can confirm there is very similar gossip, certain groups being known for drama or shittyness, elitists, the ren-equivalent of itas, fetishists (its just bondage instead of age play), etc. The drama just varies more as there's a more equal amount of men and women, as well as a much wider range of ages. I was with a fringe group for a while that had so many break ups, splits, drama, and stupidity that it drove me out. Literally within the space of three years there was usurping, the group split in half, someone tried to fuck someone else's wife, someone stole an entire pirate ship on a trailer (a full size ship made as the camp fort), numerous passes were made at the two underage girls and immediately passed off as "just kidding", and one of the main founding members turned out to not exist at all. How no one ever realized she wasn't real after 7 years of 'just missing' them at the ren fair I have no idea.