Ben Mankiewicz will serve as guest host for TCM’s Summer Under the Stars festival in August. Ben will introduce the 9th installment of the festival while Robert Osborne is taking a break. This year’s Summer Under the Stars features several people for the first time, including day-long schedules with Orson Welles, Joanne Woodward and Peter Lawford. Summer Under the Stars will also highlight Marlon Brando, Bette Davis, Jimmy Stewart, Humphrey Bogart, Cary Grant, Joan Crawford and, on what would have been her 100th birthday, Lucille Ball. Full details at www.tcm.com/summer .