There are some seriously badass hippies hanging out at Confluence Park on Sunday nights. If you never thought you'd see the words "hippie" and "badass" in the same sentence, well, you have no idea how awesome things can get in a hurry when you give half the hippie crowd hand drums and the other half fire. These informal Colorado Fire Tribe practices are free to watch, but the participants are very serious about working on their moves, which include swinging flaming balls and other jaw-dropping techniques. Occasionally, one of them will catch fire and jump in the river, which you just don't see every day.