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Some Islamic organizations in the United States post announcements reminding people of the first day of Muharram prior to the event. Muharram is one of the four sanctified months in the Islamic calendar. Some Muslim Americans choose to fast during this month, although fasting is not obligatory. Many Muslims engage in voluntary prayer, including evening prayer, during Muharram.

The Day of Ashura (or Ashurah) is known as the most sacred day in the month of Muharram. It is the 10th day of Muharram and is a day of fasting for many Sunni Muslims. Many Shi’a Muslims use the day to commemorate the martyrdom of Husayn ibn Ali in 680 CE. Some Muslims give to charity on this day.

\Muharram is the first month in the Islamic year and a time of mourning and peace. It is forbidden for Muslims to fight during this month. A number of important events in Islamic history have occurred during this month. These include:

• The Battle of Karbala (currently in Iraq) in the year 680 CE, which enabled Husayn ibn Ali, a grandson of the Prophet Muhammed, and his army to enter the city on the first day of the month.
• The restriction of Husayn ibn Ali's access to water on the seventh day.
• The death of Husayn ibn Ali and his clan (Ahl al-Bayt) on the 10th day of the month.

The Shi'a and Sunni denominations of Islam attach different weights to these events and mark them in different ways.