At 6:30 in the morning, not many people have dancing on their mind. Freshly brewed coffee, perhaps, or the papers. Maybe some public radio. But not a party.
On a street in East London, however, the sun is rising over the rooftops, and a line of people are waiting to get into a warehouse. Most were fast asleep an hour ago, but by now they're wearing fluorescent neon tights, brightly colored headbands and leggings. Some have decorated themselves with face paint.