World Naked Bike Ride
Time Out says
The annual clothing-optional bike ride takes over the streets of Chicago, attracting hundreds of scantily clad riders who help raise awareness about cyclists and positive body image. Check-in for the ride begins at 6pm in the West Loop and the ride usually runs from 8pm-11pm—for specific route details (typically announced the day of the event) check ChicagoNakedRide.org. Remember to wipe down your Divvy seat the day after.