The International Olympic Day was celebrated on 23 June 2016. To mark the occasion, over 160 National Olympic Committees (NOCs) and sports organizations across the world organized a series of events to spread Olympic values and encourage people to get involved in sports and lead more active lives.
•    The 2016 Summer Olympics host-city Rio de Janeiro unveiled its athletes' village to mark the day. The Brazilian city will host the XXXI Olympiad between 5 August and 21 August 2016.
•    The day is celebrated for promotion of participation of people in the sports all across the world, irrespective of athletic, gender or age ability.
•    The International Olympic Day was initiated in 1948 for commemorating the commencement of modern Olympic Games on 23 June 1894 at Sorbonne in Paris.
•    There are three main pillars of the International Olympic Day - discover, learn and move.
•    These three pillars of the sports event are deployed by the National Olympic Committees into sports, educational and cultural activities.

The Day of the Seafarer is being observed on 25 June every year as an expression of thanks to the seafarers for their contribution to the
economy and civil society of the world.Day of the Seafarer 2016 was observed across the world on 25 June 2016. The theme for the year is At Sea For All.
•    The theme for the year has a clear link with the 2016 World Maritime Day theme, Shipping: indispensable to the world.
•    The themes highlight the point that seafarers serve at sea not just for the shipping industry or for their own career purposes but for all of us.
•    Day of the Seafarer is observed to give thanks to the seafarers for their contribution to the economy and civil society of the world. 
•    The day also acknowledges risks and personal costs borne by them while being in their jobs.
•    The decision to designate 25 June as the Day of the Seafarer was taken by International Maritime Organization (IMO)in 2010.
•    The first edition of the Day of the Seafarers was observed by IMO in 2011.
•    The Day of the Seafarers has also been included in the list of observances by United Nations.

The International Widow's Day 2016 was celebrated across the world on 23 June 2016. The day was celebrated to raise awareness on the troubles of widowed women.
•    The day throws light on the situation of widows which is sometimes neglected due to absent in statistics, unnoticed by researchers and is mostly overlooked by civil society organizations.
•    Generally, widow women have to suffer complete social exclusion. Abuse of widows and their children constitutes one of the most serious violations of human rights and obstacles to development today. 
•    Millions of the world’s widows endure extreme poverty, ostracism, violence, homelessness, ill health and discrimination in law and custom.
•    To give special recognition to the situation of widows of all ages and across regions and cultures, the United Nations General Assembly (UNGA) declared 23 June 2011 as the first-ever International Widows’ Day to be celebrated annually.
•    Since 2011, International Widows Day is observed to sensitize the global population for the misery of the widows.

The United Nations Public Service Day was celebrated by the United Nations (UN) on 23 June 2016.The day was celebrated to mark the invaluable contributions of public servants and administrators to build a better world for all.
•    The 2016 United Nations Public Service Day was celebrated at the United Nations Headquarters in New York with a High-level Knowledge Sharing Panel on Leaving No One Behind: Innovative Institutional Approaches and Public Service Delivery.
•    This is the first time that the Day is celebrated after the 2030 Agenda for Sustainable Development was adopted by all United Nations Member States.
•    The UN Public Service Day is intended to celebrate the value and virtue of public service to the community. 
•    It highlights the contribution of public service in the development process and recognizes the work of public servants.
•    It also encouraged young people to pursue careers in the public sector.
•    On this day, the United Nations awards the public servants with the United Nations Public Service Award, the most prestigious international recognition of excellence in public service. 
•    The award Ceremony was established in 2003.

The International Day of Yoga was on 21 June 2016 observed across the world with the theme Connect the Youth.
•    This year’s observance of the Day highlights the important role healthy living plays in the realization of the Sustainable Development Goals, adopted in 2015 by all 193 UN Member States.
•    In India, the Union Government organized the event titled The National Event of Mass Yoga Demonstration at the Capitol Complex in Chandigarh where Prime Minister Narendra Modi himself performed yoga.
•    The idea to celebrate 21 June as the International Day of Yoga was initiated by Prime Minister Narendra Modi on 27 September 2014 during his address to the UN General Assembly (UNGA).
•    Following this, the UNGA on 11 December 2014 adopted the resolution to commemorate 21 June as the International Day of Yoga every year.
•    This resolution was adopted under the Global Health and Foreign Policy by the General Assembly in order to provide a holistic approach to the people worldwide for their health and well-being. 
•    More than 177 countries including USA, Canada, China and Egypt supported this move including 175 nations co-sponsoring the resolution.
•    Yoga is an ancient physical, mental and spiritual practice that originated in India and is now practiced in various forms around the world. 
•    It finds mention in the Yoga Sutras of Patanjali, the author of the grammatical Mahabhasya.
•    The word yoga is derived from Sanskrit and means to join or to unite, symbolizing the union of body and consciousness. 
•    Yoga balances body and soul, physical health and mental well-being.

World Refugee Day was observed on 20 June 2016. It is observed annually to draw attention to the plight of refugees, celebrate their courage and resilience and renew commitment to solve refugee problems.
•    It also recognizes contributions of the refugees made to the countries that host them.
•    According to the United Nations 1951 Refugee Convention, refugee is a person who fled his or her home and country owing to a well-founded fear of persecution because of his/her race, religion, nationality, membership in a particular social group, or political opinion.
•    Many refugees are in exile to escape the effects of natural or human-made disasters.
•    Developing countries host four-fifths of the world’s refugees. The 48 Least Developed Countries provide asylum to 2.3 million refugees.
•    The UN General Assembly via its resolution 55/76 on 4 December 2000 decided to observe the World Refugee Day on 20 June every year. 
•    On this day of adoption of the resolution the General Assembly also 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.
•    As per United Nations, every minute eight people leave everything behind to escape war, persecution or terror.

World Blood Donors Day (WBDD) 2016 was observed on 14 June 2016.
The theme of the 2016 World Blood Donor Day campaign is Blood connects us all. The theme highlights the common bond that all people share in their blood.
•    The slogan for 2016 WBDD is Share life, give blood. The slogan focuses on voluntary donation systems. 
•    The voluntary donation systems play a pivotal role in encouraging people to care for one another and promoting community cohesion.
•    The World Blood Donors Day was established in 2004.
•    The day was established to raise awareness of the need for safe bold and blood products. The day also expresses gratitude towards donors for their voluntary gifts of blood.
•    It is one of the eight official global public health campaigns marked by the World Health Organization (WHO).
•    The day also collides with birthday anniversary of Karl Landsteiner, who is noted for having distinguished the main blood groups in 1900.
•    The theme for the 2015 WBDD was Thank you for saving my life.
•    Apart from this there are following notable commemorative  days coming up in this month 
    June 15- World Elder Abuse Awareness Day
    June 17 World Day to Combat Desertification
    June 19 father's day
    June 20 World Refugee Day
    June 21 International Day of Yoga
    June 23 United Nations Public Service Day
    June 26 International Day Against Drug Abuse and Illicit Trafficking
    June 29 National Statistics Day

The World Day against Child Labour was observed globally on 12 June 2016 with the theme End child labour in supply chains - It's everyone's business.
•    This year, the focus for World Day Against Child Labour is on child labour and supply chains. With 168 million children still in child labour, all supply chains, from agriculture to manufacturing, services to construction, run the risk that child labour may be present.
•    To support businesses in their actions to remove child labour from their supply chains, the ILO and the International Organisation of Employers (IOE) jointly created the Child Labour Guidance Tool, a resource for companies to increase their knowledge and ability to conduct business in line with international labour standards on child labour.
•    The International Labour Organization (ILO) launched the World Day Against Child Labour in 2002 to focus attention on the global extent of child labour and the action and efforts needed to eliminate it.
•    Each year on 12 June, the Day brings together governments, employers and workers organizations, civil society to highlight the plight of child labourers and what can be done to help them.

The World Oceans Day was observed globally on 8 June 2016 with the theme Healthy oceans, healthy planet. 
•    The main focus of this year's theme is on curbing the plastic pollution.
•    Plastic pollution is a serious threat because it degrades very slowly, polluting waterways for a very long time. 
•    The United Nations celebrated World Oceans Day 2016 by recognizing the winners of the Annual World Oceans Day Oceanic Photo Competition at an event at the United Nations Headquarters. 
•    To remind everyone of the major role the oceans have in everyday life. They are the lungs of our planet, providing most of the oxygen we breathe.
•    This day is celebrated to:
•    Inform the public of the impact of human actions on the ocean.
•    Develop a worldwide movement of citizens for the ocean.
•    Celebrate together the beauty, the wealth and the promise of the ocean.
•    In 2008, the United Nations General Assembly through its resolution 63/111decided that, as from 2009, 8 June would be designated by the United Nations as the World Oceans Day.

World Environment Day (WED) was observed globally on 5 June 2016 with theme Zero tolerance for the illegal trade in wildlife. The day aims at inspiring more people to take action to prevent the growing strain on Earth’s natural systems from reaching the breaking point.
•    The host country for the WED 2016 is Angola. 
•    The year’s slogan "Go Wild for Life" encourages everyone to spread the word about wildlife crime and the damage it does. It also asks people to challenge all to do what they can to prevent it.
•    The 2016 theme highlights the fight against the illegal trade in wildlife, which erodes precious biodiversity and threatens the survival of elephants, rhinos and tigers, as well as many other species. It also undermines our economies, communities and security.
•    Illegal trade in wildlife products is eroding Earth’s biodiversity and driving whole species to the brink of extinction. 
•    As per an estimate, in 2011, a subspecies of Javan rhino went extinct in Vietnam, and the last western black rhinos vanished from Cameroon.
•    Lesser-known victims include helmeted hornbills and pangolins, as well as wild orchids and timbers like Rosewood – flowers and timber that are also considered as wildlife.
•    On this day to create awareness for environment, Railway Minister Suresh Prabhu flagged off Tiger Express, a semi-luxury tourist train, from Safdarjung station New Delhi. 
The day was established by the United Nations General Assembly (UNGA) on the day when Stockholm’s United Nations Conference on the Human Environment 1972 began.