Eid (Arabic for "feast" or "festival") is a Muslim holiday celebrated during momentous occurrences. The Feast of the Sacrifice, commonly known as Eid al-Adha, occurs in the 12th month of the Islamic lunar calendar.
It's not to be confused with Eid al-Fitr, the Fast-Breaking Festival, which we'll get to in a minute. The annual Muslim holy pilgrimage is known as Hajj, in which millions of Muslims travel to the Islamic holy site of Mecca, which concludes on Eid al-Adha.
The festival is dedicated to Prophet Abraham's ordeal when he was told to sacrifice his son, Ishmael. It's a sad story of Abraham being tasked to sacrifice his other son, Isaac, in Christian and Jewish faiths.
The command was issued to put him to the test of his allegiance and surrender to God's will. Before the event could take place, God replaced Ishmael with a sheep, according to Islamic theology. Muslims would slaughter lambs and other livestock to remember this intervention, which would then be redistributed among family, friends, and the less fortunate.
Eid al-Adha will be celebrated on 21st July this year.