This destination is only accessible for 10 days per year. Like a mirage in the desert, the Burning Man Arts Festival is fleeting. It appears and disappears in less than a fortnight. Each summer - during the final week of August that leads into the Labor Day weekend - thousands of digerati geeks, pyrotechnic enthusiasts, aging hippies and too-hip yuppies descend on a prehistoric dry lakebed in the Nevada desert known to insiders as Black Rock City. Here the fourth largest city in Nevada reaches its ritual climax on Saturday night when the giant “man” effigy is burned to the ground.