I was photographing in Penn Station late last night when I heard...

I was photographing in Penn Station late last night when I heard screaming and loud music. A huge crowd of people came around the corner. Everyone was dressed in costumes and bright colors. One dude was dressed as a rabbit. Another had a giant, flashing, neon sword. Everyone was laughing, dancing, and singing, as very loud dance music blared from a portable sound system.

“This is a new type of dance party!” someone shouted into a microphone, “Join us!” The participants fanned out through the station, encouraging onlookers to join them. “Don’t just stand there!” said the man with the microphone, “This works better if everyone is dancing!”

I approached two participants along the edge of the crowd.

“What is this?” I asked.

“We’re not exactly sure,” they answered. “We joined two hours ago, and still haven’t quite figured it out.” After a few more minutes of dancing in Penn Station, the dance party moved on, heading for another location…