The Box of Rain band took the stage Saturday night at the Sherman Theater for an evening celebrating the Grateful Dead catalogue and musical stylings circa ‘68-’74.  Led by Bob Stirner (Living Earth, Boris Garcia) on lead guitar and vocals, the six-piece, and sometimes seven-piece when “Pig Pen” (aka John Bernstein) would join the stage, wound their way through an evening of period specific dead tunes to an elated and receptive crowd.  The band is comprised of member