An outstanding lineup of entertainers gathers in the Kennedy Center Concert Hall to salute Jon Stewart, recipient of the 23rd annual Mark Twain Prize for American Humor, including Samantha Bee, Steve Carell, Dave Chappelle, Pete Davidson, Ed Helms, Jimmy Kimmel, Olivia Munn, Bassem Youssef and Bruce Springsteen. John Oliver and Stephen Colbert appeared in a pre-taped video.