'Burning Man' Temporary City

Burning Man is a week-long festival with international draw, held annually on the week prior to and including Labor Day weekend. Its current location is on the playa of the Black Rock Desert in Nevada. The temporary city (housing 36,500 residents in 2005) is put forth as an experiment in community, radical self expression, and radical self-reliance.

Some rules:
PARTICIPATION. Burning Man is held to be a "spectator-free" zone—i.e., only participants are allowed.
LEAVE NO TRACE, an ecological concept. Burning Man takes place in the middle of a normally uninhabited desert environment known as a playa, which is deep in the middle of a large, prehistoric dry lake bed.
COMMERCE FREE EVENT. No cash transactions are allowed at Burning Man. The participants instead rely on a gift economy, a sort of potlatch.
ARTS AND CRAFTS are featured, particularly outsider art and visionary art.