If you’re watching some MLB games this weekend 25-27th of august each MLB team is participating in players weekend.
What’s Player Weekend?
Players Weekend is a first-of-its kind opportunity for players to show their individual flair and allows fans to get to know them better. Established in conjunction with Major League Baseball and the MLB Players Association, all 30 clubs will be participating in all games running Friday through Sunday, and every team will be in action each of those three days.
each player is allowed to wear his nickname of choice on the back of his jersey, and a patch on his sleeve to pay tribute to a person or persons who aided their career.
For example here are the Houston Astro’s uniforms for players weekend.
This idea isn’t a requirement by the league or owners just a fun experience for the fans and the players.