Correction: It was not the Inaugural Ball. It was lat at night, the night before the Inauguration, January 198-19, 1961.
First, there was a serious concert at 8 PM in honor of Eleanor Roosevelt at Convention Hall.
Then selected guests moved on the National Guard Armory, where Kennedy's brother-in-law Peter Lawford had organized a show that included performances by Leonard Bernstein, Ella Fitzgerald, Harry Belafonte, Bette Davis, Louis Prima, Keely Smith and Sir Laurence Olivier. Frank Sinatra sang “That Old JACK Magic" and, at the new president's request, Ethel Merman sang “Everything’s Coming Up Roses."