Painting frenzy prompts Bam Margera to open his gates to appreciative crowd By Kathleen Brady Shea, Managing Editor, The Times Bam Margera sits on a couch and belts out vocals during a jam session at his art show Tuesday night. The nattily-dressed government leader looked a tad out of place in the mainly heavy-metaled, multi-pierced crowd. But the presence of Chester County Commissioners’ Chairman...