The Assumption of Mary which is the 15 of August is when we celebrate Mary’s Heavenly Birthday. Mary is the Queen of Heaven and sits between God and Jesus in Heaven. The 15 of August long ago it was Mary’s heavenly birthday but no one ever found her body and so Pope Pius declared that Mary’s body went up to heaven as well as her soul. But no one was not so sure of that because no one found her body or knew if she was dead or not.
In the Western side they believe that Mary was in Dormition. Dormition means sleeping. They believe that Mary was sleeping while she was getting taken up to Heaven. This is not a fact because still nobody knew if she died or not.
Some think that the Assumption happened in Turkey but most believe that it happened in Jerusalem because she lived there. But still nobody knew where it happened because nobody knew where her body was. The Assumption of Mary is not like the ascendence of Jesus.
We celebrate the Assumption of Mary because it is the day that God assumed Mary into heaven, following her death, according to popular Christian belief. It is the feast day of the Virgin Mother.