1908 – Cy Young Day is celebrated by 20,000 in Boston. He pitches briefly against an All-Star team that includes Jack Chesbro, Hal Chase, Willie Keeler, Harry Davis and George Mullin. The game is interrupted several times for presentations to the great hurler, including a great loving cup from the American League for all his accomplishments.

On August 13, 1908 — 1908 – Cy Young Day is celebrated by 20,000 in Boston. He pitches briefly against an All-Star team that includes Jack Chesbro, Hal Chase, Willie Keeler, Harry Davis and George Mullin. The game is interrupted several times for presentations to the great hurler, including a great loving cup from the American League for all his accomplishments.

Source:
Baseball Reference August 13
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game