MASS 
 Polka Ride - Fri 1/25/13 5:45p
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UndieMass
Polka Ride
Fri Jan 25th 2013 5:45p

Critical Mass is a very large group bike event, gathering in Chicago the last Friday of every month for more than a decade. Leaves Daley Plaza downtown (50 W Washington St) around 6pm.
ChicagoCriticalMass.org
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