William Shatner will boldly go to Packard Music Hall on Sept. 26 for a screening of “Star Trek II: The Wrath of Khan.” Following the screening, Shatner will come on stage to share fascinating and humorous behind-the-scenes stories from his seven decades-long career as an actor, producer, director, writer and — most recently — space-traveler. Shatner played Capt. James T. Kirk in the original “Star Trek” television series (1966 to 1969) and in t…