Tradition: Islam
Link: http://www2.hds.harvard.edu/spiritual/multifaith_about.html
For Sunni Muslims, it is a voluntary fast day. Many important events are believed to have occurred on this day, such as Noah’s leaving the Ark and the freedom and departure of the Children of Israel from Egypt. For Shi’i Muslims, it is a time of mourning commemorating the martyrdom of Husain (the grandson of the Prophet Muhammad) on the 10th day of the lunar month of Muharram.