This beautiful feast is observed on the same date both by the Church in the East and in the West.
Today, the most pure temple of the Savior, the precious bridal chamber and Virgin, the sacred treasure of God, enters the house of the Lord, bringing the grace of the Divine Spirit. The Angels of God praise her. She is the heavenly tabernacle.
Kontakion - sung in the Greek Orthodox Church on this Feast Day.
Presentation of the Theotokos
The Carmelite Order recalls with joy that on this day in 1904 Blessed Elizabeth of the Trinity composed her beloved Prayer to the Trinity.
From an article on the meaning of this Feast by Fr. James McCaffrey, OCD.