The Prophet's Birthday or Mawleed al Nabi
The Prophet's Birthday or Mawleed al Nabi is held on September 27. Or Mawlid al-Nabi. There is not a single verse in the Qur'an OR a Hadith of Prophet Muhammad (Peace be upon him) forbidding the celebration of Prophet's birthday. This event in the third decade of the month September is annual. 
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Mawlid, or Eid Milad-un-Nabi, is celebrated every year as the birth anniversary of Prophet Muhammad. Muslims across the world celebrate the day, which is also a designated holiday in many parts of the world.
Because Muhammad was the chosen recipient and messenger of the word of God through the divine revelations, Muslims from all walks of life strive to follow his example. After the holy Qur'an, the sayings of the Prophet (hadith) and descriptions of his way of life (sunna) are the most important Muslim texts.
Similar holidays and events, festivals and interesting facts
Anniversary of the Failed Attack on Lomé in Togo on September 24 (On this date in 1986, about 50 men attacked a military barracks that served as the home of the then-President of Togo.);
Chavang Kut on November 1 (Mizo people of Northeast India, Bangladesh, Burma);
All Saints' Day a holy day of obligation on November 1 (a national holiday in many historically Catholic countries. And its related observance: Day of the Innocents, The first day of Day of the Dead or El Dia de los Muertos celebration. - Mexico, Haiti);
Bangladesh National Day of Revolution and Solidarity on November 7
International Day of Islamic Art on November 18
Armed Forces Day in Bangladesh on November 21
Martyred Intellectuals Day in Bangladesh on December 14