At a meeting held in conjunction with the first All-Star Game, the major league players request a reduced schedule for the 1963 season. They also vote unanimously to continue playing two All-Star Games each year.

This Day In Baseball

On July 9, 1962 At a meeting held in conjunction with the first All-Star Game, the major league players request a reduced schedule for the 1963 season. They also vote unanimously to continue playing two All-Star Games each year.

Source:

Baseball Reference July 9