The 14 Hour Technicolor Dream was a concert held in the Great Hall of the Alexandra Palace, London, on 29 April 1967. The fund-raising concert for the counterculture paper International Times was organised by Barry Miles, John "Hoppy" Hopkins, David Howson, Mike McInnerney and Jack Henry Moore. It was part-documented by Peter Whitehead in a film called Tonite Let's All Make Love in London.
At the time, The 14 Hour Technicolor Dream was described as a multi-artist event, featuring poets, artists and musicians. Pink Floyd headlined the event; other artists billed included: The Crazy World of Arthur Brown, Soft Machine, The Move, Tomorrow, The Pretty Things, Jimmy Powell & The Five Dimensions, Pete Townshend, John's Children, Alexis Korner, Social Deviants, The Purple Gang, Champion Jack Dupree, Graham Bond, Savoy Brown, Ginger Johnson and his African conga drummers, The Creation, Denny Laine, The Block, The Cat, The Flies, Charlie Browns Clowns, Glo Macari and the Big Three, Gary Farr, The Interference, Jacobs Ladder Construction Company, Ron Geesin, Lincoln Folk Group, Mike Horovitz, Poison Bellows, Christopher Logue, Robert C. Randall, Suzy Creamcheese, Sam Gopal's Dream, Giant Sun Trolley, Simon Vinkenoog, Jean Jaques Lavel, The Stalkers, Utterly Incredible Too Long Ago To Remember Sometimes Shouting At People, Barry Fantoni, Noel Murphy, Dick Gregory, Graham Stevens and Yoko Ono. In the audience watching Ono's performance art that night was John Lennon who attended the event with his friend John Dunbar. Lennon had met Ono a year earlier when he attended a private preview of an exhibition of her work entitled "Unfinished Paintings and Objects" at Dunbar's Indica Gallery.