Día de la Virgen de Guadalupe occurs in December, on December 12.
The feast honors Our Lady of Guadalupe, a major religious and cultural symbol in Mexico. December 12 is associated with the traditional account of appearances of Mary to Juan Diego at the hill of Tepeyac in 1531, according to Catholic tradition.
The date matters to quinceañera customs because some Mexican celebrations include a Catholic Mass or religious blessing, and families may connect a young woman’s milestone with local Marian devotion. However, Día de la Virgen de Guadalupe is not itself a quinceañera ritual and is not limited to fifteenth-birthday celebrations.
Quinceañera practices vary widely. Some are strongly Catholic, some are secular, and many combine religious and family traditions. The Guadalupe feast therefore provides cultural context for Mexican celebrations, but it should not be treated as the universal religious requirement of every quinceañera.