When I heard a callout for participants for a stunt in Bryant Park on 42nd Street in Manhattan, there was little information about what it would involve. The brief was to wear a white top and be ready to dance. 

100 people including me gathered, stood in line in front of a stage to see whether random park goers would volunteer to be our Dance Captain. 

At first the music played and we stood motionless. Then someone in the crowd stepped onto the stage and led us. We followed to create...