The temporary town set up for Burning Man in Nevada has a higher population than the state Capital!
As of 2013, Black Rock City, a temporary town sprung up for the Burning Man Festival comprises a population of over 60,000 people compared to Carson City, Nevada's population of about 55,500. When the festival is over, the Black Rock desert goes back to being unpopulated.
The festival has grown in popularity in recent years. The event is described as an experiment in community, art, radical self-expression, and radical self-reliance. It is held in the last week of August and ends today, on Labor Day.