[2] The Eid is held on 18 Dhul-Hijjah at the time when the Islamic prophet Muhammad—according to interpretation in Shia—appointed Ali ibn Abi Talib as his successor.
[7][8] Ten years after the migration (Hijrah), the Islamic prophet Muhammad ordered his followers to call upon people everywhere to join him in his first and last pilgrimage.
[11] As a result, the date of the sermon is considered to be one of the foundational events of Shia Islam, with the anniversary becoming one of its most important annual celebrations as "Eid al-Ghadir".
[14][15] It is held in different countries, including Iran,[16][17][18] India, Pakistan, Azerbaijan,[19] Iraq,[20][21] UAE, Yemen, Afghanistan, Lebanon, Turkey,[22] Bahrain, and Syria.
[28][29] Also in the same Year the Iraqi Parliament declared Eid al-Ghadir to be an official public holiday with the encouragement of the Sadrist Leader, Muqtada al-Sadr.