Everyday Starting December 16 thru December 24. Las Posadas is a wonderful 400+ year old Advent celebration in many Latin countries. For 9 days, from December 16th-24th, the faithful prepare for Christmas by acting out and reliving the days Mary and Joseph experienced as they journeyed to Bethlehem, as written in the Gospels. Each day ending in a special song representing Joseph speaking to the inn keepers.