As we know, the Great Fast and the Great Week before Pascha are the most diligently observed fasts in the Church. After that, the most thoroughly kept fast is that before the Dormition, which in our Tradition lasts from August 1 through August 14. Like the Great Fast, the Dormition Fast has special services to set this time apart. In our Church an intercession service to the Mother of God, the Paraclisis, is held nightly.
This Fast also includes the Great Feast of the Transfiguration of Christ which is kept from August 6 to 13. This feast celebrates Christ as the radiant Light of the Father’s glory while in the Dormition we see Christ, who trampled down Death by His death, take His Mother into the light of His resurrection. This period is so rich in opportunities for prayer and worship that it has traditionally been called our “Summer Pascha.”
From the Office of Educational Services: The Fast of the Theotokos in the Home (PDF, 736KB, 18 pages)