June 26 - International Day against Drug Abuse and Illicit Trafficking

The International Day against Drug Abuse and Illicit Trafficking is a United Nations International Day against drug abuse and the illegal drug trade. It has been held annually since 1988 on 26 June, a date chosen to commemorate Lin Zexu's dismantling of the opium trade in Humen, Guangdong, just before the Opium War .The observance was instituted by General Assembly resolution 42/112 of 7 December 1987.
Links:
1.Wikipedia
2.UN Page

June 23 - United Nations Public Service Day

The UN General Assembly, in its Resolution 57/277, designated 23 June as Public Service Day (A/RES/57/277). The UN Public Service Day intends to celebrate the value and virtue of public service to the community; highlight the contribution of public service in the development process; recognize the work of public servants, and encourage young people to pursue careers in the public sector. Within the Public Service Day, the UN have established annual Public Service Awards for the positive achievements in the public service.

The United Nations Public Service Awards is the most prestigious international recognition of excellence in public service. It rewards the creative achievements and contributions of public service institutions that lead to a more effective and responsive public administration in countries worldwide.

June 20 - World Refugee Day

For years, many countries and regions have been holding their own Refugee Days and even Weeks. One of the most widespread is Africa Refugee Day, which is celebrated on 20 June in several countries.

As an expression of solidarity with Africa, which hosts the most refugees, and which traditionally has shown them great generosity, the UN General Assembly adopted Resolution 55/76 on 4 December 2000. In this resolution, the General Assembly noted that 2001 marked the 50th anniversary of the 1951 Convention relating to the Status of Refugees, and that the Organization of African Unity (OAU) had agreed to have International Refugee Day coincide with Africa Refugee Day on 20 June. The Assembly therefore decided that, from 2001, 20 June would be celebrated as World Refugee Day.
Links:
1.Refugee day
2.UN Page
3.Wikipedia

June 17 - World Day to Combat Desertification and Drought

In 1994, the United Nations General Assembly declared June 17 the "World Day to Combat Desertification and Drought" to promote public awareness of the issue, and the implementation of the United Nations Convention to Combat Desertification in Those Countries Experiencing Serious Drought and/or Desertification, Particularly in Africa.

Ever since, country Parties to the Convention, organizations of the United Nations System, international and non-governmental organizations and other interested stakeholders have celebrated this particular day with a series of outreach activities worldwide.

June 14 - World Blood Donor Day

World Blood Donor Day is day dedicated to "thanking and celebrating voluntary non-remunerated blood donors". It occurs on June 14, the birthday of Karl Landsteiner, the creator of the ABO blood group system, for which he won the Nobel Prize. The first day was held in 2007.

One of the main goals of the World Blood Donor Day is to ensure the availability of safe blood for transfusion.
Links:
World blood donor day

June 8 - World Ocean Day

World Ocean Day began on 8 June 1992 at the Earth Summit in Rio de Janeiro, Brazil. On 5 December 2008, the United Nations resolved that from 2009 that 8 June would be designated as World Oceans Day.

World Ocean Day is an opportunity every year to honor the world's ocean, celebrate the products the ocean provides, such as seafood, as well as marine life itself for aquariums, pets, and also a time to appreciate its own intrinsic value. The ocean also provides sea-lanes for international trade. Global pollution and over-consumption of fish have resulted in drastically dwindling population of the majority of species.

The Ocean Project, working in partnership with the World Ocean Network, is working to build greater awareness of the crucial role of the ocean in our lives and the important ways people can help. World Ocean Day provides an opportunity to get directly involved in protecting our future, through a new mindset and personal and community action and involvement – beach cleanups, educational programs, art contests, film festivals, sustainable seafood events, and other planned activities help to raise consciousness of how our lives depend on the ocean.
Link
1.The Ocean Project

June 05 - World Enviroment Day

World Environment Day (WED) was established by the United Nations General Assembly in 1972. WED is hosted every year by a different city and commemorated with an international exposition through the week of June 5. The United Nations Environment Programme (UNEP), also created in 1972, uses WED to stimulate awareness of the environment and enhance political attention and public action.

"Stockholm was without doubt the landmark event in the growth of international environmentalism," writes John McCormick in the book Reclaiming Paradise. "It was the first occasion on which the political, social and economic problems of the global environment were discussed at an intergovernmental forum with a view to actually taking corrective action."

Link
1.UN