U.S. TV network NBC will air another live performance of a Broadway musical, "Peter Pan," on December 4, hoping to repeat the ratings success of last year's broadcast of "The Sound of Music Live." The musicals are part of the Comcast-owned network's strategy to draw audiences to live events, a defense against later viewing on digital video recorders which is less valuable to advertisers. NBC also will air a new miniseries called "The Slap," another effort to create events that encourage audiences to watch live, NBC Entertainment Chairman Bob Greenblatt said on Sunday at a Television Critics Association meeting. The eight-episode drama tells the story of the slapping of a child at a barbecue that evolves into a court case. "The Sound of Music Live" attracted 19 million viewers on December 5. When DVR playback was added, the show beat NBC's highly rated "Sunday Night Football" that week, Greenblatt said. The cast for &quo