Festivals have long been times for games of chance, like Saturnalia dice throws...

https://www.red-bookmarks.win/festivals-have-long-been-times-for-gambling-with-cultures-using-calendars-to

Festivals have long been times for games of chance, like Saturnalia dice throws or Diwali teen patti cards. To keep things from spiraling, calendars helped set clear end dates for these risks