Well something like this might give you a clue:
It's a ride where you can never wear enough watches...
https://en.wikipedia.org/wiki/World_Naked_Bike_Ride
And New York has one too:
https://www.timeout.com/newyork/things-to-do/see-cheeky-nsfw-photos-from-the-nyc-world-naked-bike-ride-2015
But don’t expect full frontal in New York City (courtesy The Gothamist)