Snoop Dogg, Weezer and Wiz Khalifa will no doubt cast the longest shadows over B.O.M.B. Fest this weekend. But a crop of emerging local acts will have the chance to shine when they take the stage at the two-day concert festival at Hartford&amp;#8217;s Comcast Theatre. Nearly 30 bands from area cities &amp;#8212; Westport, Greenwich, Shelton, [...]