It is one of the four holy months of the Hijri lunar calendar, in order the calendar is the first month and marks the beginning of the Islamic New Year.
This month is only surpassed by Ramadán in relation to its meaning.
This year 2018, will be held from September 12 until October 9 approximately. This celebration is not the same for all Muslims, who celebrate it in different ways:
During the Muharram, several Muslims perform fasting during the day of Ashura, and some other days of the Muharram in the form of thanksgiving.
Some other Muslims like the Shiites perform and participate in rituals, which are mourning, which are performed in mesquitas to mourn the death of Hussein, remembering everything he did for justice.
And some other Muslims perform public rituals, which tend to be a bit more painful, including self-flagellations, cuts and blows to various parts of their body.
References and More information about Muharram in:
Muharram is the first month in the Hijriyah calendar. Arabs call this month Muharram because this month they forbid war. In the past the Arab Society also named the illegitimate months with munzilul assunnah (spearhead or arrow). Because when that month comes they release arrowheads
natural Hijriyah calendar. Muharram comes from a word which means 'forbidden' or 'challenged', that is prohibited from waging war or bloodshed.
Muharram's 1st is the New Year's Day in Islam.