The Feast of the Assumption of Mary (Mariae Himmelfahrt, Mariä Aufnahme in den Himmel) is celebrated in some states in Germany on August 15 each year. It is a public holiday in Saarland and some parts of Bavaria. Many Catholics attend special church services and some people collect herbs as a tradition for the day. The fourth ecumenical council was held in Chalcedon, now part of Istanbul, Turkey, in 451 CE. The council decided that the Assumption of Mary would be recognized as a Christian feast. This feast is important for Catholics because it marks the moment that Mary’s body and soul went to heaven, according to Catholic belief. The date was fixed as August 15 sometime around the year 700 CE.
It’s also a massive Orthodox holiday – having a liturgy ordaining her setting into a grave similar to the one of Christ.