http://www.huffingtonpost.com/2012/10/22/hajj-pilgrims-arrive-in-mecca_n_2001811.html?utm_hp_ref=religion

This source talk about the people who are going to be in mecca to do the annual haj pilgrimage. And explain what there are going to do there and how to do it. The Muslims over there at the Haj time should were white clothes and they sleep at a marble because they move from place to place. Also, last year nearly 3 million pilgrims went to Mecca for Haj, only third of them from Saudi Arabia.