Festivals have long mixed celebration with a bit of gambling, from Saturnalia's...

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

Festivals have long mixed celebration with a bit of gambling, from Saturnalia's dice games to Diwali’s teen patti and Lunar New Year mahjong. These traditions often relied on calendars to mark when the fun—and the risk—should end