United Nations observation days
UN terms them as International day or World Day or Global day or Just day ...
If you want to see when is parents day you will go to P for parents but it is Global Day of parents, so it will come in G.
For convenience of use, we put them in P and first say Parents day and second we will say it as Global Day of parents, so we adhere to UN names and also convenience of users

AIDS
World AIDS Day
1 December 2021

Albinism
International Albinism Awareness Day
13 June


African Descent
International Day For People Of African Descent
31 August

Africa Industrialization Day
20th November

Anti-corruption
International Anti-Corruption Day
9 December

Antibiotic Awareness
World Antibiotic Awareness Week, 13-19 November
13 November 2021

Arabic Language Day
18th December

Argania
International Day Of Argania
10 May 2021

Asteroid
International Asteroid Day
30 June


Audiovisual Heritage

World Day For Audiovisual Heritage
27 October

Autism Awareness
World Autism Awareness Day
2 April 2021


Banks
International Day Of Banks
4 December

Bee
World Bee Day
20 May 2021

Bicycle
World Bicycle Day
3 June 2021

Biological Diversity
International Day For Biological Diversity
22 May

Blood Donor
World Blood Donor Day
14 June 2021

Book And Copyright
World Book And Copyright Day
23 April 2021

Braille
World Braille Day
4 January 2021

Breastfeeding
World Breastfeeding Week
1 August 2021

Chagas
World Chagas Disease Day
14 April 2021

Charity
International Day Of Charity
5 September

Chernobyl
International Chernobyl Disaster Remembrance Day
26 April


Chemical Warfare
Day Of Remembrance For All Victims Of Chemical Warfare
30th November

Chess
World Chess Day
20 July 2021

Children's
World Children's Day
20 November 2021

Cities
World Cities Day
31 October 2021

Child Labour
World Day Against Child Labour
12 June


Chinese Language Day
20th April

Civil Aviation
International Civil Aviation Day
7 December


Clean Air For Blue Skies
International Day Of Clean Air For Blue Skies
7 September

Combat Desertification And Drought

World Day To Combat Desertification And Drought
17 June

Conscience
International Day Of Conscience
5 April


Cooperatives
International Day Of Cooperatives
3 July


Cotton
World Cotton Day
7 October 2021

Creativity And Innovation
World Creativity And Innovation Day
21 April 2021


Crime Of Genocide And Of The Prevention Of This Crime
International Day Of Commemoration And Dignity Of The Victims Of The Crime Of Genocide And Of The Prevention Of This Crime
9 December


Cultural Diversity For Dialogue And Development
World Day For Cultural Diversity For Dialogue And Development
21 May 2021

Delegate's Day
International Delegate's Day
25 April 2021

Democracy
International Day Of Democracy
15 September

Development Information
World Development Information Day
24 October

Diabetes
World Diabetes Day
14 November

Diplomacy For Peace

International Day Of Multilateralism And Diplomacy For Peace
24 April


Disabilities

International Day Of Persons With Disabilities
3 December

Disarmament Week
24th October

Disaster Risk Reduction
International Day For Disaster Risk Reduction
13 October


Discrimination

Zero Discrimination Day
1 March 2021


Drug Abuse And Illicit Trafficking
International Day Against Drug Abuse And Illicit Trafficking
26 June

Down Syndrome

World Down Syndrome Day
21 March

Drowning
World Drowning Prevention Day
25 July

Economic And Social Development
International Volunteer Day For Economic And Social Development
5 December 2021

Education
International Day Of Education
24 January


Elimination Of Nuclear Weapons

International Day For The Total Elimination Of Nuclear Weapons
26 September


Elder Abuse

World Elder Abuse Awareness Day
15 June

End Obstetric Fistula
International Day To End Obstetric Fistula
23 May


Environment
World Environment Day
5 June

Enforced Disappearances

International Day Of The Victims Of Enforced Disappearances
30 August

English Language Day
23rd April

Equal Pay Day
International Equal Pay Day
18 September 2021

Epidemic Preparedness

International Day Of Epidemic Preparedness
27 December


Eradication Of Poverty
International Day For The Eradication Of Poverty
17 October


Exploitation Of The Environment In War And Armed Conflict
International Day For Preventing The Exploitation Of The Environment In War And Armed Conflict
6 November


Families

International Day Of Families
15 May

Family Remittances

International Day Of Family Remittances
16 June

Female Genital Mutilation
International Day Of Zero Tolerance To Female Genital Mutilation
6 February


Food
World Food Day
16 October

Food Loss And Waste

International Day Of Awareness Of Food Loss And Waste
29 September


Food Safety
World Food Safety Day
7 June


Forests

International Day Of Forests
21 March

French Language Day
20th March

Friendship
International Day Of Friendship
30 July


Genocide Against The Tutsi In Rwanda

International Day Of Reflection On The 1994 Genocide Against The Tutsi In Rwanda
7 April

Girl Child

International Day Of The Girl Child
11 October


Habitat
World Habitat Day
4 October

Happiness
International Day Of Happiness
20 March


Hate Speech
International Day For Countering Hate Speech
18 June

Health
World Health Day
7 April

Health Coverage Day
International Universal Health Coverage Day
12 December 2021


Hepatitis
World Hepatitis Day
28 July


Holocaust
International Day Of Commemoration In Memory Of The Victims Of The Holocaust
27 January


Human Fraternity

International Day Of Human Fraternity
4 February

Human Rights Day
10 December


Human Rights Violations

International Day For The Right To The Truth Concerning
Gross Human Rights Violations And For The Dignity Of Victims
24 March

Human Space Flight
International Day Of Human Space Flight
12 April


Human Solidarity Day
International Human Solidarity Day
20 December 2021


Humanitarian
World Humanitarian Day
19 August

ICT Day
International Girls In ICT Day
22 April 2021


Impunity For Crimes Against Journalists
International Day To End Impunity For Crimes Against Journalists
2 November


Immunization
World Immunization Week
24 April 2021

Indigenous
World's Indigenous Peoples
International Day Of The World's Indigenous Peoples
9 August

Innocent Children Victims Of Aggression
International Day Of Innocent Children Victims Of Aggression
4 June


Interfaith Harmony

World Interfaith Harmony Week
1 February 2021

Jazz
International Jazz Day
30 April 2021

Light

International Day Of Light
16 May

Literacy Day
International Literacy Day
8 September 2021

Living Together In Peace
International Day Of Living Together In Peace
16 May


Malaria

World Malaria Day
25 April 2021

Maritime
World Maritime Day
30 September 2021

Media
Global Media And Information Literacy Week
24 October


Mental Health

World Mental Health Day
10 October 2021

Meteorological
World Meteorological Day
23 March 2021

Micro-, Small And Medium-Sized Enterprises Day
27 June 2021


Migrants Day
International Migrants Day
18 December 2021

Migratory Bird Day

World Migratory Bird Day
8 May 2021

Migratory Bird Day

World Migratory Bird Day
9 October 2021

Mine Awareness
International Day For Mine Awareness And Assistance In Mine Action
4 April


Missing Staff Members
International Day Of Solidarity With Detained And Missing Staff Members
25 March


Mother Earth Day
International Mother Earth Day
22 April 2021


Mother Language Day
International Mother Language Day
21 February 2021

Mountain Day
International Mountain Day
11 December 2021

Nelson Mandela International Day
18 July 2021


Neutrality
International Day Of Neutrality
12 December


No-Tobacco
World No-Tobacco Day
31 May 2021

Non-Violence
International Day Of Non-Violence
2 October

Nowruz
International Day Of Nowruz
21 March

Nuclear Tests
International Day Against Nuclear Tests
29 August


Oceans

World Oceans Day
8 June 2021

Older Persons
International Day Of Older Persons
October 1 every year. 2021 Theme: Digital Equity for All Ages


Ozone Layer
International Day For The Preservation Of The Ozone Layer
16 September


Palestinian People
International Day Of Solidarity With The Palestinian People
29 November


Parents
Global Day Of Parents
1 June


Parliamentarism
International Day Of Parliamentarism
30 June


Patient Safety

World Patient Safety Day
17 September 2021

Peace

International Day Of Peace
21 September

Peace And Development
World Science Day For Peace And Development
10 November 2021

Philosophy
World Philosophy Day
18 November 2021

Poetry

World Poetry Day
21 March 2021

Population

World Population Day
11 July 2021

Portuguese Language
World Portuguese Language Day
5 May 2021

Post

World Post Day
9 October 2021

Press Freedom
World Press Freedom Day
3 May 2021

Property

World Intellectual Property Day
26 April 2021


Protect Education From Attack
International Day To Protect Education From Attack
9 September 2021

Pulses
World Pulses Day
10 February 2021

Racial Discrimination
International Day For The Elimination Of Racial Discrimination
21 March

Racism
Week Of Solidarity With The Peoples Struggling Against Racism And Racial Discrimination
21 March 2021


Radio
World Radio Day
13 February 2021

Refugee
World Refugee Day
20 June 2021

Remembrance For Road Traffic Victims
World Day Of Remembrance For Road Traffic Victims
21 November

Rural Women
International Day Of Rural Women
15 October

Russian Language Day
6 June 2021


Safety And Health At Work

World Day For Safety And Health At Work
28 April

Science And Peace
International Week Of Science And Peace
9 November 2021


Seafarer
Day Of The Seafarer
25th June

Second World War
Time Of Remembrance And Reconciliation For Those Who Lost Their Lives During The Second World War
8 May 2021


Sexual Violence
International Day For The Elimination Of Sexual Violence In Conflict
19 June


Sign Languages
International Day Of Sign Languages
23 September


Slave Trade And Its Abolition
International Day For The Remembrance Of The Slave Trade And Its Abolition
23 August

Slavery
International Day For The Abolition Of Slavery
2 December

Social Justice

World Day Of Social Justice
20 February

Soil

World Soil Day
5 December 2021

Solstice
International Day Of The Celebration Of The Solstice
21 June

Space Week

World Space Week
4 October 2021


Spanish Language Day
23 April 2021


Sport For Development And Peace
International Day Of Sport For Development And Peace
6 April


Statistics
World Statistics Day
20 October 2020 : Theme : Connecting the world with data we can trust.
World Statistics Day is celebrated every five years on 20 October.
It started in 2010, then 2015, then 2020

Sustainable Gastronomy Day
18 June 2021

Teachers
World Teachers' Day
5 October 2021

Tea Day
International Tea Day
21 May 2021

Telecommunication And Information Society
World Telecommunication And Information Society Day
17 May 2021


Television
World Television Day
21 November 2021

Toilet
World Toilet Day
19 November 2021

Tourism
World Tourism Day
27 September 2021

Tsunami Awareness
World Tsunami Awareness Day
5 November 2021

Tuberculosis
World Tuberculosis Day
24 March 2021

Tuna
World Tuna Day
2 May 2021

Tolerance

International Day For Tolerance
16 November

Trafficking In Persons
World Day Against Trafficking In Persons
30 July

Transatlantic Slave Trade

International Day Of Remembrance Of The Victims Of Slavery And The Transatlantic Slave Trade
25 March


Translation Day
International Translation Day
30 September 2021

Tropics
International Day Of The Tropics
29 June

Universal Access To Information

International Day For Universal Access To Information
28 September

UN Global Road Safety Week
17 May 2021


UN Peacekeepers
International Day Of UN Peacekeepers
29 May

United Nations Day
24 October 2021

United Nations Public Service Day
23 June 2021


United Nations Day For South-South Cooperation
12 September 2021

Unregulated Fishing
International Day For The Fight Against Illegal, Unreported And Unregulated Fishing
5 June

Vesak, The Day Of The Full Moon
26 May 2021


Victims Of Terrorism

International Day Of Remembrance And Tribute To The Victims Of Terrorism
21 August

Victims Of Torture
United Nations International Day In Support Of Victims Of Torture
26 June 2021


Violence Against Women
International Day For The Elimination Of Violence Against Women
25 November

Violence Based On Religion Or Belief
International Day Commemorating The Victims Of Acts Of Violence Based On Religion Or Belief
22 August

Water

World Water Day
22 March 2021

Widows
International Widows' Day
23 June 2021


Women And Girls In Science
International Day Of Women And Girls In Science
11 February

Women Judges
International Day Of Women Judges
10 March


Women's
International Women's Day
8 March 2021


Week Of Solidarity With The Peoples Of Non-Self-Governing Territories
25 May 2021



Wetlands
World Wetlands Day
2 February 2021

Wildlife
World Wildlife Day
3 March 2021

Yoga
International Day Of Yoga
21 June

Youth
International Youth Day
12 August 2021

Youth Skills
World Youth Skills Day
15 July 2021