Eid al-Ghadir 18 Dhul-Hijjah

Ten years after the Hijrah, the Islamic prophet Muhammad commanded his followers to call people everywhere to join him on his first and final pilgrimage. Islamic scholars believe that over seventy thousand people followed Muhammad on his way to Mecca, where, on the fourth day of Dhu'l-Hijjah, over one hundred thousand Muslims were present for his entry into the city.

Upon returning from this pilgrimage on 18 Dhu'l-Hijjah 10 AH (March 632 CE) in an area known as Ghadir Khumm, Muhammad delivered a well-known sermon in which he called his cousin brother and son-in-law Ali ibn Abi Talib and declared, "To whomever I am Mawla, Ali is also their Mawla." While the meaning of the word Mawla can be interpreted as "master," and thus see the sermon as the official designation of Ali as Muhammad's successor.

Accordingly, the date of the sermon is considered one of the founding events of Shia Islam, with the anniversary becoming one of its most important annual celebrations under the name "Eid al-Ghadir".

According to the narrations, Hassan ibn Ali used to hold ceremonies in Kufa on the day of Ghadir. Ali ibn Abitalib used to participate in the ceremony accompanied by a group of his followers. After the ceremony, Hassan ibn Ali would offer gifts to people. Greeting, shaking hands, wearing new clothes, using perfume, making donations, helping others, saying prayers, feeding others, making others happy, and giving gifts to others are some of the suggested customs reported in the narrations.