Nollaig na mBan (pronounced Nullig na Mon), or "Women's Christmas," is an Irish tradition celebrated on January 6th, the Feast of the Epiphany, marking the end of Christmas festivities.

Vivienne features in National Geographic speaking about Nollaig na mBan and how a new generation is shaping the tradition through culture and community. After a journalist discovered Vivienne’s viral video(s) on the holiday, she was invited to share her perspective on how Nollaig na mBan has evolved from a quiet regional tradition in Cork and Kerry into a modern celebration of women, identity, and Irish cultural revival.

Born and raised on a farm in County Cork, Ireland, Vivienne Sayers O’Callaghan moved to Queens in 2023, and soon began posting videos on her page @vivienne_in_nyc. O’Callaghan’s ingenuity — mixed with some luck of the Irish — caused her page to explode, and within six months she had 150,000 followers. “I found this niche,” she said. “Then I solidified this amazing base of Irish and Irish-Americans globally, especially on the east coast of the US.”Her lessons on Irish language and culture have become as popular as green beer on St. Patrick’s Day, going viral on TikTok.