Going on it's 3rd installment, in support of positive body image and gender equality the last Friday in July, more than 1,000 Chicago Critical Mass participants are encouraged to bike in their underwear. 
The Ride ends at an Underwear Dance Party in support of gender equality. The movement: GET IN (your underwear), GET ON (your bike), and GET OFF (your hang-ups)...riding through the streets of Chicago in our underwear in support of green transportation, gender equality, and positive body image. Let your skin breathe!
All bodies are celebrated…board it, skate it, bike it, love it! Body paints, sound bikes and contraptions, minimal attire, and good energy are all welcome here!
Daley Plaza, 5:00 p.m.
Dance party to follow! Details coming soon!
For more info about Chicago Critical mass and how you can propose/post a map or become involved...http://chicagocriticalmass.org/
Facebook group with information about related happenings:
https://www.facebook.com/groups/UnderwearMassDanceParty