The great feasts in honor of our Lord are:
Nativity of Christ (December 25)
Baptism of Christ - Theophany, also called Epiphany or Denaha (January 6)
Presentation of Jesus at the Temple (February 2)
Transfiguration (August 6)
Exaltation of the Cross - Sleeba Perunnal (September 14)
Triumphant Entry into Jerusalem - Hosanna also called Palm Sunday (Sunday before ressuruction or Qyomto Sunday)
Ressuruction of our Lord - Pascha or Qyomto
Ascension of Christ - (40 days after the ressuruction)
Pentecost (50 days after the ressuruction)
The feasts of the Theotokos
The syriac orthodox church oberves the following feasts in honor of the Theotokos:
January 15 : Feast of the Virgin of the Sowing
March 25 : Annunciation to the Virgin (with Holy Qurbana even if the day happens to be Good Friday)
May 15 : Feast of the Virgin Mary of the Harvest.
August 15 : Dormition (Falling Asleep) of the Theotokos (with 15 days of fasting)
September 8 : Nativity of the Theotokos (with 8 days of fasting / optional)
November 21 : Presentation of the Theotokos to the temple
December 26 : Glorification of the Mother of God.