According to Jesse Jarnow " the original contract shows 5 nights at the Rainbow at the tour's start (April 5, 6, 7, 8, 9) & 3 more shows at the Rainbow at the tour's end (May 26, 27, 28) replaced by Empire Pool when the Rainbow closed"
Historical
Richard Nixon and Leonid Brezhnev sign the SALT I treaty in Moscow, as well as the Anti-Ballistic Missile Treaty and other agreements.