After 11 years, The Witcher 3 might finally let us experience Belleteyn firsthand in new DLC, Songs of the Past – if a Gamescom booth from CD Projekt Red offers anything to go by.
Belleteyn has sadly only been mentioned by the developer in The Witcher 3 thus far, as a massive celebratory fertility festival with food, drink, love, and you name it (think Beltane, its real-world Gaelic counterpart).
Interestingly enough, however, it is the birthday of Yennefer, and in The Witcher books, Geralt believes it's also around the same time that Ciri herself was born… so, yeah, it's a pretty big deal.