MASS 
 Polka - Fri 1/25/2008 6p
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Chicago Critical Mass
Polka
Fri Jan 25th 2008 6p

Critical Mass is a very large group bike event, gathering in Chicago the last Friday of every month for 20+ years. Leaves Daley Plaza downtown (50 W Washington St) around 6pm.
Contact: John Greenfield
Facebook.com/ChicagoCriticalMass
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