At Shibe Park, 15,000 fans witness the first legal baseball game between major league teams played on a Sunday in the city of Philadelphia. In a hometown exhibition game, the Phillies defeat the Athletics, 8 – 1.

On April 8, 1934 – At Shibe Park, 15,000 fans witness the first legal baseball game between major league teams played on a Sunday in the city of Philadelphia. In a hometown exhibition game, the Phillies defeat the Athletics, 8 – 1.

Source
Baseball Reference April 8