What is Eid al-Adha? At the end of the Hajj (annual pilgrimage to Mecca), Muslims throughout the world celebrate the holiday of Eid al-Adha (Festival of Sacrifice). In 2008, Eid al-Adha will begin on approximately December 8th, and will last for three days. What does Eid al-Adha commemorate? During the Hajj, Muslims remember and commemorate the trials and triumphs of the Prophet Abrah... more.