On july 1, 1917 Despite a state law banning Sunday baseball, the Robins play their first Sunday game in Brooklyn, charging regular admission and beating the Phils, 3 – 2. Charles Ebbetsannounces that the admission will benefit the Militia of Mercy, a wartime charity, and is for a pregame band concert and military drill exhibition before the game. When the band concert ends ticket sales stop to conform with the Sunday baseball laws. More than 12,000 attend. Despite the maneuver, Ebbets and manager Wilbert Robinson are arrested, and will pay a small fine.

Source
Baseball Reference July 1