For some reason I was expecting something Killer7 related, that said, these people are wearing the wrong colors to be dancing to the music playing. No fluffies = no rave.
That chubby kid's face says is all. For a little context, Tompkins park has been one of the more dangerous parks in Manhattan, always filled with psycho bums. These people would be dancing around like that even if there wasn't rave music playing.