What date Orthodox Church celebrates the Virgin Mary?

The Virgin Mary is commemorated on several dates in the Orthodox Church:

Sept. 8: Nativity of the Theotokos (Virgin Mary)

Nov. 21: The Entrance (or Presentation) or the Virgin into the Temple

Dec. 26: Synaxis of the Theotokos

March 25: Annunciation

Aug. 15: Dormition of the Theotokos (called Assumption in the Roman Catholic Church)