Muharram is not merely a mourning ceremony but a season of reflection!

Greif is widespread... The world's most colossal mourning carnival held annually wherever Muslims are. It's fourteen centuries that tenth of Muharram--the first lunar moth--brings back the sad memories of Imam Hussein's martyrdom.
Prophet Muhammad's beloved grandson on his epic journey to restore the Islamic Cause deviated by the so-called Islamic governor Yazid went through the dessert of Karbala only to be deserted by those who pledged their support for him.
the day called Ashura, the panical of the age-old unfair battle between vice and virtue.
one side thousands of Yazid's soldiers thirsty for blood, the other side Hussain and his only 72 companions thirsty for water. in the battlefield Imam Hussain's men were slain one by one pointedly.
The climax of Ashura was the time when they embattled Imam Hussein and the remainder of his companions left defense to say their noon prayers.
later imam Hossein master of the martyrs was heartrendingly decapitated before the eyes of his family. the event was commemorated differently in Muslim countries....((Quoted for Hamed Abdi))
The religious period of worship begins with Muharram which is he first month of the lunar calendar and to many its a season of reflection.

Congregants of various faiths participated in a mourning rituals alongside Shiah Muslims in Muharram. IRIB's Masoud Karian looks into why Ashura has become an inter-denomination of servants.