The main Christmas celebration in Mexico is called las posadas, which refers to processions reenacting Joseph and Mary's search for a place to stay in Bethlehem. The processions begin nine days before Christmas because the original journey from Nazareth to Bethlehem took nine days. Friends and family members divide themselves into two groups-pilgrims and innkeepers. The pilgrims travel from house to house asking for a shelter and are refused at each until they finally reach the house where an alter and Nativity scene have been set up. Here the pilgrims are admitted with great rejoicing, a traditional prayer is spoken, and the party begins. Food and drink are served and then children take turns trying to break open the pinata.