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Tonight, 21st Ward alderman Antonio French (also of PubDef.net), launches the O'Fallon Park Jazz Concert Series in, natch, O'Fallon Park; the sponsor is Sheldon Concert Hall. Tonight's performers are the Bosman Twins, who make frequent appearances at Jazz at the Bistro as well as bigger venues like the SoHo Jazz Festival in England. The show starts at 6:30 p.m. and is free. --Stefene Russell