International Mother Language Day (UNESCO) is a worldwide annual observance held on 21 February to promote awareness of linguisticand cultural diversity and promote multilingualism.

Zero Discrimination Day is an annual day celebrated by the UN and other international organisations. The day aims to promote equality before the law and in practice throughout all of the member countries of the UN.

The International Day of Happiness (known as Happiness Day) is celebrated throughout the world on the 20th of March.

World Meteorological celebrated every year on 23rd March. This day often features various events such as conferences, symposia and exhibitions for meteorological professionals, community leaders and the general public. Some events aim to attract media attention to raise meteorology's profile.

The United Nations' International Day for Mine Awareness and Assistance in Mine Action is observed on April 4 each year. This day aims to raise awareness about landmines and progress toward their eradication.

April 7, 2004 was recognized as an international observance the International Day of Reflection on the 1994 Genocide in Rwanda by the United Nations. Commemorative events were held in several world capitals including Kigali, Rwanda, New York City, Dar-es-Salaam, Tanzania, and Geneva, Switzerland. All member states of the UN were invited to join in one minute of silence in memory of the victims.

UN English Language Day is observed annually on 23 April. The event was established by UN's Department of Public Information in 2010 "to celebrate multilingualism and cultural diversity as well as to promote equal use of all six official languages throughout the Organization.

World Intellectual Property Day is observed annually on 26 April. The event was established by the World Intellectual Property Organization (WIPO) in 2000 to "raise awareness of  how patents, copyright, trademarks and designs impact on daily life" and "to celebrate creativity, and the contribution made by creators and innovators to the development of societies across the globe".

The International  Dance Day is celebrated every year on 29th April. The main purpose of Dance Day events is to attract the attention of the wider public to the art of dance. Emphasis should be given to addressing a new public, people who do not follow dance events during the course of the year. Every […]

International Jazz Day is an International Day declared by the United Nations Educational, Scientific and Cultural Organization in 2011 "to highlight jazz and its diplomatic role of uniting people in all corners of the globe." It is celebrated annually on April 30.