Ashura this year will be marked in most places on August 29. But for the Shia, it is also a major religious event to commemorate the martyrdom of Husayn Ibn Ali al-Hussein, the grandson of the Prophet Muhammad, who died at the Battle of Karbala in 680 AD. Every year since then, many Shia mark Ashura by performing a pilgrimage to the mausoleum of Imam al-Hussein, which is traditionally to be held his tomb in Karbala.