The contest winners in question are children who participated in a baby pageant and tournament. They are accompanied by their mothers, the collective group who are staying at the world famous Ambassador Hotel. The main purpose of their trip is to tour the MGM Studio. Beyond eating at the studio commissary, the group visit many movie sets, most specifically that for The Wizard of Oz (1939), where they meet the movie's three male leads Ray Bolger, Buddy Ebsen and Bert Lahr.
Did You Know?
References The Wizard of Oz