Today the Church celebrates the feast of the Presentation of the Lord which occurs forty days after the birth of Jesus and is also known as Candlemas day, since the blessing and procession of candles is included in today's liturgy.
Founded by Pope St. John Paul II in 1997, today is the World Day of Prayer for Consecrated Life. He attached it to "Candlemas Day" because the consecrated men and women are to be the light in the world, imitating Jesus, the Light of the World.
The previous (1962) liturgical calendar refers to this feast as the "Purification of Mary." This is known as a "Christmas feast" since it points back to the Solemnity of Christmas. Many Catholics practice the tradition of keeping out the Nativity creche or other Christmas decorations until this feast.
According to the Mosaic Law, a mother who had given birth to a boy was considered unclean for seven days. Also, she was to remain 33 days “in the blood of purification.” The presentation of the Lord concludes the celebration of the Nativity and with the offerings of the Virgin Mother and the prophecy of Simeon, the events now point toward Easter.
Almighty ever-living God, we humbly implore your majesty that, just as your Only Begotten Son was presented on this day in the Temple in the substance of our flesh, so, by your grace, we may be presented to you with minds made pure.
Through our Lord Jesus Christ, your Son, who lives and reigns with you in the unity of the Holy Spirit, God, for ever and ever.