August is the month of the assumption of the Blessed Virgin Mary. Here is one of the earliest quotes about the assumption of the Blessed Mother by Saint Gregory of Tours from the end of the 6th century:
The Apostles took up her body on a bier and placed it in a tomb; and they guarded it, expecting the Lord to come. And behold, again the Lord stood by them; and the holy body having been received, He commanded that it be taken in a cloud into paradise: where now, rejoined to the soul, she rejoices with the Lord’s chosen ones.”
Gregory of Tours, Book of Miracles, 1:4
All the early accounts assume the presence of the Holy Apostles at the assumption of Mary. This is typically how it is depicted in religious art.