Eid-e-Ghorban, also known as the Feast of Sacrifice or Al Eid Al Kabeer, is an important Islamic holiday observed on the 10th day of the Islamic month of Dhu al-Hijjah. This holiday commemorates the Prophet Ibrahim's willingness to sacrifice his son Ismail as an act of obedience to Allah. It is celebrated by millions of Muslims around the world, particularly during the Hajj pilgrimage in Mecca. The holiday lasts for three to four days and is marked by various customs, including special prayers and sermons in mosques. Many Muslims also undertake the pilgrimage to Mecca around this time. The specific day of Eid-e-Ghorban is determined by lunar observations, which can lead to variations in its celebration across different countries.