MASS 
 Polka Mass - Fri 1/30 5:45p
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 A Few Clouds 24F NW13
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Polka Mass
Fri Jan 30th 5:45p

Critical Mass is a very large group bike event, gathering in Chicago the last Friday of every month for 15+ years. Leaves Daley Plaza downtown (50 W Washington St) around 6pm.
ChicagoCriticalMass.org
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1/29 12:17p Friday's map is now on MassUp.us
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