MASS 
 Underwear Mass - Fri 7/30/10 6p
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 13F NW5-19 Partly Cloudy 45h 5i
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Polka Mass!
Underwear Mass
Fri Jul 30th 2010 6p

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.
Contact: Barbra R
ChicagoCriticalMass.org
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