The Theotokos, was informed of her impending death by an angel three days before it happened and began to prepare appropriately.
She prayed on the Mount of Olives and gave her belongings to two of her widowed neighbors. Because not all the Apostles were in Jerusalem on the day of her Dormition, as they were preaching "throughout the world," a cloud caught them up and brought them to her. The only one absent was the Apostle Thomas.
The Dormition of the Theotokos occurred in the house of the Evangelist John, where the mother of the God-Man resided. After they closed her eyes, the Apostles carried her bier to the Garden of Gethsemane, where they buried her.
During the transfer of her relic, fanatic Jews attempted to overturn her bier but were struck blind. Only one of them managed to touch it, but an invisible sword cut off his hands.
As previously mentioned, the only one absent from her funeral was the Apostle Thomas. When he arrived at her tomb three days later, he requested to open her tomb and he found only the burial cloths. Evidently, the Panagia had been resurrected.
A magnificent church was built over her tomb, attributed to Saint Helena. After its destruction, the Byzantine Emperor Marcian (450-457) and Pulcheria - his second wife - built a new church, which exists to this day.
Every year on August 15th, time in Greece seems to stand still. Everyone pauses to celebrate the "Sweet-kissing One, Lady of the Sea, the Heart of Man who embraced Him whom heaven and earth could not contain," as Nikos Kazantzakis wrote.
Notes:
«Ομολογούμεν δε και την Δέσποιναν ημών, την αγίαν Μαρίαν κυρίως και
αληθώς Θεοτόκον, ως τεκούσαν σαρκί τον ένα της αγίας Τριάδος Χριστόν τον
Θεόν ημών… συν τούτοις δε και τας δύο φύσεις ομολογούμεν του
σαρκωθέντος δι’ ημάς εκ της αχράντου Θεοτόκου και αειπαρθένου Μαρίας,
τέλειον αυτόν Θεόν και τέλειον ανθρωπον γινώσκοντες…»
"We confess (proclaim) that our Lady, Saint Mary, is truly and genuinely Theotokos, for she gave birth in the flesh to one of the Holy Trinity, Christ our God... along with this, we also confess the two natures of Him who was incarnate for us from the pure Theotokos and ever-virgin Mary, knowing Him as perfect God and perfect man."
[The Holy Seventh Ecumenical Council]
«Ομολογούμεν την αγίαν Παρθένον Θεοτόκον, διά το τον Θεόν Λόγον
σαρκωθήναι και ενανθρωπήσαι και εξ αυτής της συλλήψεως ενώσαι εαυτώ τον
εξ αυτής ληφθέντα ναόν»
"We confess the holy Virgin as Theotokos, for from her the Word of God became incarnate and became man, and from the very moment of conception, He united with Himself the temple (i.e., the human nature) that He received from her."
[The Holy Third Ecumenical Council]
Sources:
https://www.dogma.gr/diafora/ti-den-gnorizoume-gia-ti-zoi-kai-to-thanato-tis-panagias/105094/
https://www.dogma.gr/diafora/to-prosopo-tis-theotokou-2/185445/
https://www.pemptousia.gr/2023/08/o-zoiforos-thanatos-tis-panagias/
https://en.wikipedia.org/wiki/Dormition_of_the_Mother_of_God
The magazine "St. Gregory the Hesychast," published by the Holy Monastery of St. Gregory of Mount Athos, vol. 21 (1996), article: "The Lady Theotokos, Root of Our Freedom,"
https://www.janus.gr/2022/08/blog-post_15.html