I have been preaching this message since MLB decided to move the game: Valid picture ID to travel to the game by air, check into hotel, and enter the stadium -- all of which are places of public transport/accommodation under the Civil Rights Act of 1964.
Per new MLB rules all batters must show the home plate umpire picture ID before entering the batter’s box and immediately after scoring a run . Failure to do so will invoke an automatic out, same as the infield fly rule.