Festival gambling has long been part of celebrations, from Saturnalia dice...

https://calendar.cx/luck-on-the-calendar-holidays-built-around-games-of-chance/

Festival gambling has long been part of celebrations, from Saturnalia dice games to Diwali’s teen patti and Lunar New Year mahjong. These traditions often used calendars to mark a clear end to the risk, helping keep the fun from turning into trouble