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[email protected]. Calendar of Holidays September 2017 - September 2018 September 1 (Begins at sundown on August 31 st) [Moves] Eid al-Adha (Islam) Eid al-Adha is the Festival of Sacrifice held at the conclusion of the Hajj. Those who can afford to do so sacrifice their best domestic animals, such as sheep or cows. This practice recalls Abraham's willingness to sacrifice his son, in obedience to God, and commemorates God's forgiveness. September 1 Church year begins (Orthodox Christianity) This day marks the beginning of the Orthodox Christian liturgical calendar. September 8 Nativity of Mary (Christianity) This feast originates in fifth century Jerusalem and celebrates the birth of the Virgin Mary, mother of Jesus. This is recognized in the Orthodox, Roman Catholic and Anglican Churches. September 12 Ghambar Paitishem (Zoroastrianism) This is the third of the six Ghambar festivals in the Zoroastrian year. This five-day seasonal festival celebrates the creation of the earth, and the summer crop harvest. September 14 Holy Cross Day (Christianity) This day recognizes the Cross as a symbol of triumph in the Christian religion. The date traces back to the dedication of the Church of the Holy Sepulcher on September 14, 335. By order of Saint Helena and her son, the first Christian Roman Emperor Constantine, the church was built over the ruins of the Crucifixion and Burial sites in Israel. According to some traditions, it was also at this site that Helena found the True Cross.