Excerpt adapted from Ilm magazine, December, 1989*
‘Id-e-Ghadir is celebrated by the Shi ‘ite communities to mark the event that took place at Ghadir Khumm (Valley of the Pond) on the 18th Dhul-Hijjah. This event commemorates the designation (appointment by way of nass) of Hazrat All as the ‘Amir-ul-Mu’minin (commander of the faithful) and Imamul-Muslimin’ (the Imam of the community of believers) at Ghadir-i Khumm when the Prophet (s.a.s.) was returning from his Last Pilgrimage (hajjatul-wida) in the year 632 AC. On this occasion, the Prophet publicly proclaimed Ali to be his successor  in guiding the community after the end of the institution of Nubuwwah. According to the Shi’a doctrine, tradition and interpretation of history, the designation of Hazrat Ali marked the beginning of the institution of Imamah. The designated Imam was to continue the ta’wil (interpretation) and talim (teaching) of Allah’s Final Message, i.e. the Holy Qur’an.
Accordingly, throughout the course of the history, the Shi’a have commemorated this occasion as a mark of recognition and acceptance of Allah’s mercy to mankind by bestowing continued guidance. Each Imam, since the time of Hazrat Ali has designated his successor. The Imam in his time has continued to guide his followers according to the prevailing conditions. His function has always been to look after the welfare of the community both in spiritual and worldly (material) matters. His guidance to his followers is that they should lead their lives in such a way so as to practice their Faith with a sense of balance and harmony, ensuring that there is no conflict between the two aspects of an individual’s life. The practice of the Faith thus becomes the way of life.
Presently, the Shi’a Imami Ismaili Muslims celebrate the day of accession of their present Imam to the office of Imamah as Yaum-e Imamat or Imamat Day. This occasion is celebrated as a mark of gratitude to Allah in having bestowed His mercy and bounty in guiding them through the office of the Imam on Sirat al-Mustaqim (the Straight Path).
Date posted: October 22, 2013
Please also click: Ghadir-Khumm – “I Wish I’d Been There” and Other Writings
 Vagglieri, Ghadir Khumm, The Encyclopedia of Islam, Vol II, E.J. Brill, 1965, pp. 993-994
* For link to complete article, please click Muslim Festivals and Religious Observances.