The actual tour started on this day in 1967, according to Bob Dearborn's The Olde Disc Jockey's Almanac...
September 11, 1967…The Beatles' "Magical Mystery Tour" bus started cruising the English countryside "just to see what would happen." Unfortunately, nothing did. There was no script, no clear idea of exactly what was to be accomplished, not even a clear direction about where the bus was supposed to go. The film was a disaster and received scathing reviews. It was called the Beatles' first failure.
Yes, the film was a failure, but the songs on that special are among the best Beatles song ever. Including this one...