In Bulgaria (and elsewhere), Orthodox Christians marked
the Feast of the Presentation of the Virgin Mary
From the Novinite article:
The feast is associated with an event recounted in the apocryphal Infancy Narrative of James where Mary's parents, Joachim and Anne, who had been childless, received a heavenly message that they would bear a child. As a sign of gratitude for the gift of their daughter, they brought her to the Temple in Jerusalem to consecrate her to God. Mary remained in the Temple until puberty, at which point she was assigned to Joseph as guardian.