A series of Midsummer Classic games is proposed by William Veeck, president of the Cubs. Although the idea receives some support, it will be 64 years before a team from the American League plays a club from the National League during the regular season.

On August 8, 1933 — A series of Midsummer Classic games is proposed by William Veeck, president of the Cubs. Although the idea receives some support, it will be 64 years before a team from the American League plays a club from the National League during the regular season.

Source:
Baseball Reference August 8
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game