I saw a Tiktok about this. I then watched a video and did some more research:
The promotion was meant to improve attendance at the game by offering cups of low-alcohol beer for just 10 cents each (equivalent to $0.62 in 2023), a substantial discount on the regular price of 65 cents (equivalent to $4.02 in 2023), with a limit of six beers per purchase but with no limit on the number of purchases made during the game.
6 beers per purchase is an interesting choice.
Six days earlier, the Indians and the Rangers had been involved in a widely-publicized bench-clearing brawl; the game therefore drew a rowdy and belligerent crowd. As the game proceeded, on-field incidents and massive alcohol consumption further agitated the audience, many of whom threw lit firecrackers streaked across the playing field, and openly smoked marijuana.
Having beer night after player brawls in previous games is not a good idea.
Continued degradation of the game culminated in a riot in the ninth inning when fans rushed the field. Players were forced to protect themselves with bats while retreating from the field.
Players had to protect themselves with bats. 🤣