Since this is a series on Mary, I selected one of the traditional Western designations for this feast. It’s also known as the Presentation of Christ at the Temple and in Orthodoxy it’s one of the twelve Great Feast of the liturgical year. Both names are technically correct. The events of the feast are described in Luke 2:22-40. After giving birth to a male child, under Mosaic the mother was considered ritually unclean for seven days and was then to “remain in the blood of her purification” for thirty-three days. Once the forty days had passed, the parents were to appear in the Temple with the child, make the required offering to redeem the child from the Temple, and the mother would receive prayers from the priest and be cleansed.
Mary followed the law and along with Joseph presented Jesus and herself at the Temple forty days after his birth. Jesus was redeemed with two turtle doves, suggesting Joseph was not wealthy, or perhaps indicating that Mary was one of the righteous poor. Simeon the Just and Anna the Prophetess encountered Christ during his presentation.
Orthodox Christians still practice a Christianized variation of the forty day period. The mother and child remain home and away from Church (and generally going out as little as possible) for forty days following the birth. After that period, the mother and child are “Churched.” These are the Greek Orthodox prayers for the Churching of a mother and child after forty days.
It’s also the Feast on which candles which will be used in worship for the rest of the year are blessed. So in the West it also became known as Candlemas.