Muharram and Ashura
Muharram is a month of remembrance that is often considered synonymous with the event of Ashura. Ashura, which literally means the "Tenth" in Arabic, refers to the tenth day of Muharram. It is well-known because of historical significance and mourning for the martyrdom of Hussein ibn Ali, the grandson of Muhammad.
Shias start the mourning from the 1st night of Muharram and continue for two months and eight days. However the last days are the most important since these were the days where Hussein and his family and followers (consisting of 72 people, including women, children and aged people) were killed by army of Yazid I at the Battle of Karbala on his orders, Surviving members of the family of Hussein and that of his followers were taken captive and marched to Damascus and imprisoned there.
Muharram is also observed by Dawoodi Bohras in the same way as Shias.They practice prayers on the sayings of the present dawah of Bohras, Mohammed Burhanuddin. On the tenth day of Muharrum, they pray for Hussein till the magrib namaz. When the namaz ends, Hussein is considered shahid by Yazid. It is also close to the day of resurrection because it said in a book that this world will one day come to an end on Friday 10th of Muharram.