MASS 
 Polka Mass! - Fri 1/29 5:45p
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 43F NW9-18 Mostly Cloudy 61h 38i
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Polka Mass!
Fri Jan 29th 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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