This year, the holiest Muslim holiday of Eid al-Adha is expected to begin on Sunday, September 11.

The Eid al-Adha is Islam's holiest festival celebrated annually around the world and an official holiday in Muslim-majority countries.

Eid al-Adha 2016 is expected to begin on Sunday, September 11. Authorities in Saudi Arabia will confirm the actual dates of the Muslim festival and the Hajj pilgrimage in Mecca on September 1 based on the sighting of the moon.