MASS 
 Polka Mass - Fri 1/31/14 5:45p
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Chicago Critical Mass
Polka Mass
Fri Jan 31st 2014 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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2/23 7:51p ~1029 W 21st St
CCM RT @PstafarianPrice: New job, new commute distance, the @DivvyBikes shift to 45 minutes for members couldn't be bette...
CCM RT @Zotex: "HAPPY FRIDAY" from the February 2018 Chicago Critical Mass! "Whooo-hooo!!!" #bikeChi
CCM  ~1029 W 21st St
CCM  ~1029 W 21st St
CCM  ~1029-1099 W 21st St
CCM  ~1029-1099 W 21st St
CCM  ~2100-2198 S Carpenter St
CCM  ~2023-2099 S Carpenter St
CCM  ~2000-2048 S Carpenter St
CCM  ~1118-1138 W 21st St
CCM  ~1168 W 20th Pl
CCM  ~1200-1212 W 21st St (~1141-1199 W 20th Pl)
CCM  ~1940-1944 S Racine Ave
CCM  ~1854-1898 S Racine Ave
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