How the event is mourned differs between different branches of Shia and different ethnic groups. The event is also observed by many Sunnis, but to a lesser extent, and as a time of remembrance, rather than mourning.

In the Twelver three traditional schools (Usooli, Akhbari, and Shaykhi), mourners, both male and female, congregate (in separate sections) for sorrowful, poetic recitations performed in memory of the death of Husayn, lamenting and grieving to the tune of beating drums and chants of "Ya Husayn." Passion plays are also performed, reenacting the Battle of Karbala and the suffering and death of Husayn at the hands of Yazid. They offer condolences to Imam-e-Zamana also known as Imam al-Mahdi whom they believe will avenge the blood of Husayn and bring justice to the world.

Bektashis and Alevis also mourn, and they keep themselves from eating and drinking ("fasting") the first 10--12 days of Muharram. In this period, the Alevis wear black clothes, do not shave themselves and avoid any type of entertainment and pleasure. Originally, it was also forbidden to bathe and change clothes during this period, but today most Alevis do not follow this rule. This is called "Muharrem Matemi", "Yas-i Muharrem" or "Muharrem orucu". But because it is also called "fasting", many people falsely think that Alevis celebrate the Muharram. The definition of the "fast" in this connection is different from the normal type of "fasting". Bektashis also greet each other by saying "Ya Imam! Ya Husayn."

The only Ismaili group which mourns are the Mustaali, who mourn similarly to the majority of Twelvers. Although, Nizari Ismaili commemorate Muharram through the tradition of not celebrating marriages, birthdays, and other religious celebrations during this time to show respect to there other Muslim brothers who are mourning.

In South Asia, a number of literary and musical genres, produced by both Shias and Sunnis, that have been inspired by the Battle of Karbala are performed during the month, such as marsiya, noha and soaz. This is meant to increase the peoples understanding of how the enemies fought The Battle of Karbala against Husayn and his followers. In Trinidad and Tobago and Jamaica all ethnic and religious communities participate in the event, locally known as "Hosay" or "Hussay"[citation needed]. In Indonesia, the event is known as Tabuik (Minangkabau language) or Tabut (Indonesian).

Source:Wikipedia

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