Bengali New Year (Bengali: নববর্ষ Nôbobôrsho) or Poela Boishakh (পহেলা বৈশাখ Pôela Boishakh or পয়লা বৈশাখ Pôela Boishakh or Poila Boishakh) is the first day of the Bengali calendar, celebrated in both Bangladesh and West Bengal, and in Bengali communities in Assam and Tripura. Pohela Boishakh connects all ethnic Bengalis irrespective of religious and regional differences. It falls on April 14 or April 15 of the Gregorian calendar depending on the use of the new amended or the old Bengali calendar respectively. In Bangladesh, it is celebrated on April 14 according to the official amended calendar designed by the Bangla Academy. In Bangladesh, Pohela Boishakh is a national holiday and in West Bengal and Assam it is a public (state) holiday and is publicly celebrated on April 15 every year.

Vesak is an annual holiday observed traditionally by practicing Buddhists in South Asian and South East Asian countries like Nepal, Singapore, Vietnam, Thailand, Cambodia, Malaysia, Sri Lanka, Myanmar, Bangladesh, Indonesia and India. Sometimes informally called "Buddha's Birthday," it actually encompasses the birth, enlightenment (Nirvana), and passing away (Parinirvana) of Gautama Buddha.

Language Movement Day or Language Revolution Day (ভাষা আন্দোলন দিবস Bhasha Andolon Dibosh), which is also referred to as Language Martyrs' Day or Martyrs' Day (শহীদ দিবস Shohid Dibosh), is a national day of Bangladesh to commemorate protests and sacrifices to protect Bangla as a national language during Bengali Language Movement of 1952.

Eid ul-Fitr (Arabic: عيد الفطر ‘Īdu l-Fiṭr‎), often abbreviated to Eid, is a Muslim holiday that marks the end of Ramadan, the Islamic holy month of fasting. Eid is an Arabic word meaning "festivity", while Fiṭr means "to break fast"; and so the holiday symbolizes the breaking of the fasting period. It is celebrated after the end of the Islamic month of Ramadan, on the first day of Shawwal. Eid ul-Fitr lasts for three days of celebration and is sometimes also known as the "Smaller Eid" (Arabic: العيد الصغير al-‘īdu ṣ-ṣaghīr‎) as compared to the Eid ul-Adha that lasts four days and is called the "Greater Eid" (Arabic: العيد الكبير al-‘īdu l-kabīr‎). Muslims are commanded by the Quran to complete their fast on the last day of Ramadan and then recite the Takbir all throughout the period of Eid.

This day is celebrated as the Independence Day in Bangladesh. This commemorates the declaration of independence, and the start of Bangladesh Liberation War in 1971. The day is a national holiday in Bangladesh, and is celebrated with parades, and paying of respect at Jatiyo Smriti Soudho, the national memorial at Savar near Dhaka.

International Workers' Day (a name used interchangeably with may day) is a celebration of the social and economic achievements of the international labor movement. May Day commonly sees organized street demonstrations and street marches by millions of working people and their labour unions throughout most of the countries of the world.

Eid al-Adha (Arabic: عيد الأضحى‎ ‘Īdu l-’Aḍḥā) "Festival of Sacrifice" or "Greater Eid" is an important religious holiday celebrated by Muslims worldwide to commemorate the willingness of Abraham (Ibrahim) to sacrifice his son as an act of obedience to God, but instead was able to sacrifice a ram (by God's command). Eid is also about spending time with family and friends, sacrifice, and thanksgiving for being able to afford food and housing. In traditional or agrarian settings, each family would sacrifice a domestic animal, such as a sheep, goat, cow, or camel, by slaughter (though many contemporary muslims do not sacrifice an animal as part of their observance). The meat would then be divided into three equal parts to be distributed to others. The family eats one third, another third is given to other relatives, friends or neighbors, and the other third is given to the poor as a gift. Eid al-Adha is the latter of two Eid festivals celebrated by Muslims, whose basis comes from the Quran. Like Eid ul-Fitr, Eid al-Adha begins with a short prayer followed by a sermon (khuṭba). Eid al-Adha is celebrated annually on the 10th day of the month of Dhul Hijja (ذو الحجة) of the lunar Islamic calendar. The festivities last for three days or more depending on the country. Eid al-Adha celebrations start after the Hajj, the annual pilgrimage to Mecca in Saudi Arabia by Muslims worldwide, descend from Mount Arafat. The date is approximately 70 days after the end of the month of Ramadan.

Krishna Janmashtami (Devanagari कृष्ण जन्माष्टमी) , also known as "Krishnashtami","Saatam Aatham" ,"Gokulashtami", "Ashtami Rohini", "Srikrishna Jayanti", "Sree Jayanthi" or sometimes merely as "Janmashtami", is a Hindu festival celebrating the birth of Lord Krishna, an avatar of the Hindu deity Vishnu.

Durga Puja (Bengali: দুর্গা পূজা, ‘Worship of Durga’), also referred to as Hiia Durgotsab (Bengali: দুর্গোৎসব, ‘Festival of Durga’), is an annual Hindu festival in South Asia that celebrates worship of the Hindu goddess Durga. It refers to all the six days observed as Mahalaya, Shashthi , Maha Saptami, Maha Ashtami, Maha Nabami and Bijoya Dashami. The dates of Durga Puja celebrations are set according to the traditional Hindu calendar and the fortnight corresponding to the festival is called Debi Pokkho (Bengali: দেবী পক্ষ, ‘Fortnight of the Goddess’). Debi Pokkho is preceded by Mahalaya (Bengali: মহালয়া), the last day of the previous fortnight Pitri Pokkho (Bengali: পিতৃ পক্ষ, ‘Fortnight of the Forefathers’), and is ended on Kojagori Lokkhi Puja (Bengali: কোজাগরী লক্ষ্মী পূজা, ‘Worship of Goddess Lakshmi on Kojagori Full Moon Night’).

Victory day (Bengali: বিজয় দিবস Bijôe Dibôsh) is a national holiday in Bangladesh celebrated on December 16. On this day in 1971, the Pakistani Army surrendered to the Indo-Bangladeshi High Command in Dhaka, ending the 9 month-long Bangladesh liberation war and 1971 Bangladesh atrocities. General AAK Niazi, the Commanding officer of Pakistan Army forces located in East Pakistan, surrendered his forces to Lt. Gen. Jagjit Singh Aurora, the Allied forces commander. India also commemorates victory over Pakistan on the same day in 1971 on Vijay Diwas.

Christmas or Christmas Day is an annual Christian holiday commemorating the birth of Jesus Christ. It is celebrated on December 25, but this date is not known to be Jesus' actual birthday, and may have initially been chosen to correspond with either the day exactly nine months after some early Christians believed Jesus had been conceived, a historical Roman festival, or the date of the northern hemisphere's winter solstice. Christmas is central to the Christmas and holiday season, and in Christianity marks the beginning of the larger season of Christmastide, which lasts twelve days