Dormition of the Most Holy Theotokos + August 15

Shudder, O ye heavens! and, O earth, give ear unto these words: God descended once before for our sake; He descends again today for His Mother.
--from The Lamentations at the Bier of the Mother of God, Tone 5

O thou most Holy Virgin, who knew not wedlock, the heavens rejoice in thy glorious falling asleep, the hosts of angels are glad, and the whole earth crieth out in joy, singing to thee the funeral song, O Mother of the Lord of all, thou who hast delivered human kind from its ancestral condemnation.
--Orthros of the Feast, Tone 4

The Feast of the Dormition of the Theotokos: an introduction by Archpriest Ayman Kfouf
Worshipping the Virgin Mary? An Orthodox Understanding, by Christopher Holwey
Teachings and traditions for the Feast of the Dormition
St. John of Damascus on the Dormition
A Description of the Theotokos by St. Maximus the Confessor
Tender Love and the Dormition: Frederica Mathewes-Green on Ancient Faith Radio
Mary, Our Cause of Rejoicing, by His Grace Bishop Basil