One of the key events of the Islamic calendar is the Prophet's Birthday.
It marks the anniversary of the birthday of Muhammad.
Muslims know it as Mawlid al Nabi, with mawlid meaning birth in Arabic and nabi meaning prophet. So it translates as Birth of the Prophet.
t's also spelled as Mawlud or Milad and sometimes known as Eid Milad-un-Nabi.
Of course, Eid is the word for a festival or celebration and is also found in the name of major events Eid ul Fitr and Eid ul Adha as well as the lesser-known Eid ul Ghadeer.
Watch Eid ul Adha prayers at Small Heath Park
When is Mawlid al Nabi in 2018?
Watch massive Hussaini Procession through Balsall Heath with horse and shrine
Mawlid is observed in Rabi' al-awwal, the third month in the Islamic calendar.
Although the name of the month means 'the first spring', the Islamic calendar is lunar and so dates move around and this month is - as is the case this year - nowhere near the spring. © Trinity Mirror Shared Services LimitedThe annual procession - to celebrate the birth of the prophet Muhammad - goes from the Jamia Masjid Mohiuddin Siddiquia on Victoria Road, Aston, to Aston Park
These are the only halal food options at Birmingham Airport
Islamic scholars disagree on the exact date of Muhammad's birth.
But the accepted date for the occasion among Sunni Muslims is taken as the 12th day of the month while Shia Muslims observe it on the 17th day.
In 2018, the 12th day is November 20 and the 17th day is November 25.
Islamic schools 'in breach of law' over segregation of boys and girls
Bearing in mind that Islamic dates run from sunset to sunset, Mawlid al Nabi will run (for Sunnis) from sunset on November 20 to sunset on November 21, or (for Shias) from sunset on November 25 to sunset on November 26.
How is it celebrated?
Mawlid is observed by praising Allah, fasting, public processions, poetry, family gatherings and the decoration of streets and homes.
A procession of thousands of Muslims takes place in Birmingham each year, organised by the Jamia Mosque Mehr-ul-Millat in Shakespeare Street, Sparkhill.
Islamic Calendar 2019 - All the Muslim holidays and festivals and what they mean
In addition, up to 30,000 Muslims from across the country traditionally gather in Aston Park to celebrate the birthday of the prophet Muhammad, following a huge procession from nearby Jamiah Masjid Mohiddin Siddiquia Masjid in Victioria Road.
It's the largest Mawlid celebration in Europe. The parade includes a horse-drawn carriage and the waving of bright banners and flags. © Provided by Trinity Mirror Shared Services Limited
Inside Birmingham's new halal sweet shop which has got customers very excited
But there has been fierce discussion in the Islamic world over the celebration of Mawlid and whether it should be allowed.
Some people believe these celebrations of Muhammad's birthday are haram (forbidden) on the grounds that it's an "innovation of misguidance" that does not comply with the Qur'an and the consensus among scholars.
These are the UK supermarkets and restaurants which sell halal meat
But others say celebrating the birth of the prophet is fine because it is an "innovation of guidance" and the deeds practised on this day bring rewards to those who observe the event.
The Islamic community remains strongly divided over this complex and contentious issue.
Is Mawlid a holiday?
Mawlid is a national holiday in many Muslim majority countries except Saudi Arabia and Qatar where the celebrations are forbidden.
It's not a holiday in the UK.