Michael Kennedy and Barbara Fayth Humphrey A half-hour before Friday's performance of On Golden Pond at the Circa '21 Dinner Playhouse, the theatre's producer (and Pond director) Dennis Hitchcock took the stage, and after making the traditional opening-night welcomes, warned that the show's first act alone ran nearly 80 minutes - a long haul, he explained, for elder audiences. Yet I'm thinking that Hitchcock's announcement was made less out of concern for the crowd's bladders than out of justifiable pride - a trek to the restroom would force people to miss parts of the show, and with the stunningly fine performance Michael Kennedy is giving here, who would want to miss even one?