This is a call for Christians to pray October 13 - 15, 2013! The Hajj, one of the five pillars of the Islamic religion, begins on the 8th day of the 12th month of Dhul Hijjah of the Islamic calendar. Because the calendar is based on the moon’s cycle, the Hajj begins nine days earlier each consecutive year. In 2013, the Hajj will start on October the 13th and last for 3-4 days. During this time, Muslims from all over the world will flock to Mecca to perform the rituals and follow the steps of Muhammad, their prophet.

http://www.pray-ap.info/hajj has a prayer guide plus a brief prayer video for it.