Imagine: John Lennon 75th Birthday Concert (2015) In honor of what would have been John Lennon's 75th birthday, Blackbird Presents and AMC brings you Imagine: John Lennon 75th Birthday Concert, an all-star concert event celebrating the music and message of the legendary music icon. The one-night-only concert event taping was held at the Theater at Madison Square Garden on Saturday, December 5th, and aired exclusively on AMC on Saturday, December 19th at 9:00pm ET/PT. Along with a stellar lineup, the show included very special video appearances by the remaining members of The Beatles, Paul McCartney and Ringo Starr. Golden Globe and Screen Actors Guild Award-winner Kevin Bacon was the special guest host of this star-filled event.