Holy Days

Holy Days are defined by the Church as "the faithful are obliged to participate in the Mass. Moreover they are to abstain from those works and affairs which hinder the worship to be rendered to God, the joy proper to the Lord’s day, or the suitable relaxation of mind and body." In Eastern Orthodoxy, there are 12 Holy Days in the religious year and they are:

The Nativity of the Virgin Mary (September 8)
The Elevation of the Life-giving Cross (September 14)
The Presentation of the Virgin Mary in the Temple (November 21)
Christmas (December 25)
Epiphany (January 6)
The Presentation of Christ in the Temple (February 2)
The Annunciation (March 25)
Palm Sunday (the Sunday before Easter)
The Ascension (40 days after Easter)
Pentecost (50 days after Easter)
The Transfiguration (August 6)
The Repose of the Virgin Mary (August 15)