John Lennon announces he's leaving the Beatles
On September 20th 1969, John Lennon announced he was leaving the Beatles. Lennon had already formed the Plastic Ono Band with Eric Clapton and played at the Rock and Roll Revival festival in Toronto, on September 13th.
The Beatles were at a meeting with Allen Klein to discuss a new recording contract and John just blurted out to Paul that he was leaving the group. McCartney tried to convince him to stay, saying the band would get back to their roots and play smaller shows, but John's mind was clearly made up.
"I must admit we'd known it was coming at some point because of his intense involvement with Yoko. John needed to give space to his and Yoko's thing. Someone like John would want to end The Beatles period and start the Yoko period; and he wouldn't like either to interfere with the other."
Most of the joy the band had in the early days was gone and things went from bad to worse, particularly after the death of Brian Epstein. Ringo has stated that he would have went on with the Beatles for another few years. But John and George were itching to go and nothing was really going to hold them together at this stage.
All things must pass.