During a festival I once saw a fairly serious altercation between a large group of (US) civil war reinactors and and equally large group of morris dancers. Evidently, both groups had been scheduled to use the same area at the same time, and neither was inclinded to give up without a fight. Many people at the festival seemed to think this was all part of the show, but as far as I know morris dancers never fought against union troops in the civil war. Mighty entertaining, I'll have to say. The troops won the day, as the morris dancers could not stand against a charge with fixed bayonets.