MASS 
 UndieMass - Fri 7/28 5:45p
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 71F E5 Clear
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UndieMass
Fri Jul 28th 5:45p

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.
ChicagoCriticalMass.org
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