Comedian Dave Chappelle arrives at Kennedy Center for the Performing Arts to receive the 22nd Annual Mark Twain Prize for American Humor in Washington on Oct. 27, 2019, left, actor-comedian Pete Davidson attends the premiere of "Big Time Adolescence" on March 5, 2020, in New York, center, and comedian Jon Stewart performs at the 9th Annual Stand Up For Heroes event in New York on Nov. 10, 2015. Chappelle, Davidson and Stewart will perform in a star-studded group of comedians to perform for one night only at Madison Square Garden to mark the 20th anniversary of 9/11. All proceeds from “NYC Still Rising After 20 Years: A Comedy Celebration” will benefit 9/11 charities. (AP Photo)