According to a statement from the Astan, it has been cancelled due to concerns about spread of the coronavirus, al-Sumaria News reported.
The Ghadir festival is annually held at the holy shrine of Imam Ali (AS).
The event of Ghadir, or Eid al-Ghadir, is celebrated by Shia Muslims around the world every year. It is among important feasts and happy holidays of Shia Muslims held on the 18th day of Dhul Hijja in the lunar Hijri calendar.
It was the day when according to reports, the Holy Prophet (PBUH) appointed Ali ibn Abi Talib (AS) as his caliph and the Imam after himself following an order from God.
It will fall on Saturday, August 8, this year.
The coronavirus outbreak that originated in Wuhan, China, has infected over 18.2 million people around the world and killed more than 693,000.
The outbreak has had a major impact on global sporting, cultural, religious and political events, with a host of events canceled or postponed.
Iraq has reported 129,151 coronavirus cases and 4,868 deaths from COVID-19 so far.