A live TV spectacle 20 years in the making. “Dancing With the Stars” honors two decades of stars, spins, and surprises. ET the only show with Tom Bergeron after his triumphant return to the ballroom. His pointed message to show bosses. Plus, how they pulled off a Prince William cameo. And, inside the emotional tributes, the perfect scores, and the love stories that started on the dance floor. Then, Jimmy Kimmel sobs in his return to Late Night after the loss of his best friend and bandleader. And, George Clooney on keeping his twins out of the spotlight. Plus, his next move back to the ER? Could he pop up on “The Pitt” with Noah Wyle? Then, a first look at the “Devil Wears Prada” sequel.