International Mother Language Day is a worldwide annual observance held on 21 February to promote awareness of linguistic and cultural diversity and to promote multilingualism. First announced by UNESCO on 17 November 1999, it was formally recognized by the United Nations General Assembly with the adoption of UN resolution 56/262 in 2002. Mother Language Day is part of a broader initiative "to promote the preservation and protection of all languages used by peoples of the world" as adopted by the UN General Assembly on 16 May 2007 in UN resolution 61/266, which also established 2008 as the International Year of Languages. The idea to celebrate International Mother Language Day was the initiative of Bangladesh. In Bangladesh, 21 February is the anniversary of the day when the people of Bangladesh (then East Pakistan) fought for recognition for the Bangla language. It is also celebrated in West Bengal, India.
The Independence Day of Bangladesh, which takes place on 26 March, is a Bangladeshi national holiday. It commemorates the country's declaration of independence from Pakistan in the early hours of 26 March 1971.
Zulfikar Ali Bhutto conspired with Yahya Khan and changed their position, refusing to hand over power to Sheikh Mujib. Negotiations began between the two sides, however the ruling West Pakistani leadership did not trust Sheikh Mujib, due to instances such as the Agartala conspiracy case. When it became evident that the promises made by the West Pakistan government were not going to be kept, many East Pakistani Bangla-speaking Muslims and Hindus began a spirited struggle for independence. On 7 March 1971 Sheikh Mujib gave his famous speech at the Ramna Racecourse, in which he called for a non-cooperation movement.
Pohela Boishakh is the first day of the Bengali calendar which is also the official calendar of Bangladesh. This festival is celebrated on 14 April in Bangladesh and 15 April in the Indian states of West Bengal, Tripura, and Assam (Barak Valley) by Bengalis regardless of religious faith.
The festival is celebrated with processions, fairs and family time. The traditional greeting for Bengalis in the new year is "Shubho Noboborsho" which is literally "Happy New Year". The festive Mangal Shobhajatra is organized in Bangladesh. In 2016, the UNESCO declared this festivity organized by the Faculty of Fine Arts, University of Dhaka as a cultural heritage of humanity.
Victory day is a national holiday in Bangladesh celebrated on 16 December to commemorate the defeat of the Pakistan Armed Forces in the Bangladesh Liberation War in 1971 and the Independence of Bangladesh. It commemorates the Pakistani Instrument of Surrender, wherein the commander of the Pakistani Forces, General AAK Niazi, surrendered to the Mukti Bahini and their Indian allies, ending the nine-month Bangladesh Liberation War and 1971 Bangladesh genocide and marking the official secession of East Pakistan to become the new state of Bangladesh.
This day and event is also commemorated across India as the "Vijay Diwas" to honor Indian and Bangladeshi martyrs who laid down their lives in the war.