I decided to organize a list of all the world's commemorative dates, I feel that it will helps me to have some ideas for communication on social networks or to create campaigns on e-commerce. Some moments can't be useful and other can give great ideas to communicate something funny and interesting.
But be careful, only when it makes sense! Always putting commemorative dates just because you don't have any better idea is not good, we should focus on showing the public the product and/or service that our client sells.
The existence of international days predates the establishment of the United Nations, but the UN adopted this tool, thus helping to promote international awareness and action on various issues, or just to commemorate anniversaries of important events in history.
JANUARY
January 1st - World Day of Peace
January 1st - New Year's Day
January 4th - World Braille Day
January 4th - World Hypnotism Day
January 11th - International Thank You Day
January 15th - International Composer's Day
January 16th - International Spicy Food Day
January 18th - International Laughter Day
January 21th - World Religion Day
January 23th - World Freedom Day
January 24th - International Education Day
January 27th - International Port Wine Day
January 29th - World Puzzle Day
FEBRUARY
February 4th - World Cancer Day
February 6th - International Day of Zero Tolerance to Female Genital Mutilation
February 10th - World Pulses Day
February 11th - World Day of the Sick
February 11th - International Day of Women and Girls in Science
February 13th - World Radio Day
February 13th - World Marriage Day
February 14th - International Day of Love
February 15th - International Day of Children with Cancer
February 18th - International Asperger Syndrome Day
February 20th - World Day of Social Justice
February 21th - International Mother Language Day
February 27th - International Polar Bear Day
February 28th - World Rare Disease Day
MARCH
March 1st - Zero Discrimination Day
March 1st - World Civil Protection Day
March 3rd - World Wildlife Day
March 4th - World Day of Prayer
March 8th - International Women's Day
March 10th - World Kidney Day
March 11th - World Plumbing Day
March 15th - World Consumer Rights Day
March 15th - World Sleep Day
March 15th - International Day Against Police Violence
March 20th - International Day of Happiness
March 20th - World Oral Health Day
March 20th - French Language Day
March 21th - International Day for the Elimination of Racial Discrimination
March 21th - World Poetry Day
March 21th - World Tree Day
March 21th - World Puppet Day
March 21th - International Nowruz Day
March 21th - International Down Syndrome Day
March 21th - International Day of Forests
March 22th - World Water Day
March 23th - World Meteorology Day
March 24th - World Tuberculosis Day
March 24th - International Day for the Right to the Truth about Serious Violations of Human Rights and the Dignity of Victims
March 25th - International Day of Remembrance for Victims of Slavery and the Transatlantic Slave Trade
March 25th - International Day of Solidarity with Detained and Missing Employees
March 26th - Earth Hour
March 27th - World Theater Day
March 31th - World Backup Day
APRIL
April 1st - International Day of Fun at Work
April 2nd - International Children's Book Day
April 2nd - World Autism Awareness Day
April 4th - International Landmine Hazards Awareness Day
April 4th - World Mouse Day
April 5th - International Day of Conscience
April 6th - International Day of Sport for Development and Peace
April 6th - World Physical Activity Day
April 7th - World Health Day
April 7th - International Beaver Day
April 7th - International Day for Reflection on the 1994 Genocide against Tutsi in Rwanda
April 8th - International Gypsy Day
April 11th - World Parkinson's Disease Day
April 12th - International Space Flight Day
April 15th - World Art Day
April 16th - World Voice Day
April 17th - World Hemophilia Day
April 18th - World Day for Monuments and Sites
April 20th - Chinese Language Day
April 21th - World Creativity and Innovation Day
April 22th - International Earth Day
April 23th - World Book and Copyright Day
April 23th - English Language Day
April 23th - Spanish Language Day
April 23th - World Scouting Day
April 24th - International Day of Multilateralism and Diplomacy for Peace
April 24th - World Laboratory Animal Day
April 25th - World Malaria Day
April 25th - International Day of Young Women in ICT
April 25th - World Penguin Day
April 26th - International Day of Remembrance for the Chernobyl Disaster
April 26th - World Intellectual Property Day
April 27th - International Guide Dog Day
April 27th - World Graphic Designer Day
April 28th - World Day for Safety and Health at Work
April 29th - World Dance Day
April 30th - International Jazz Day
April 30th - World Veterinary Medicine Day
MAY
May 1st - World Laughter Day
May 2nd - World Tuna Day
May 3rd - World Press Freedom Day
May 3rd - World Asthma Day
May 4th - International Firefighters Day
May 5th - World Traffic and Courtesy Driving Day
May 5th - World Hand Hygiene Day
May 5th - International Midwife Day
May 5th - World Portuguese Language Day
May 6th - International Tuba Day
May 6th - International No Diet Day
May 7th - World Ankylosing Spondylitis Day
May 8th - World Red Cross Day
May 8th - World Social Security Day
May 8th - World Ovarian Cancer Day
May 10th - World Lupus Day
May 11th - World Migratory Bird Day
May 12th - International Nurses Day
May 15th - International Day of Families
May 16th - International Day of Light
May 16th - International Day of Life in Union for Peace
May 17th - World Telecommunications and Information Society Day
May 17th - World Internet Day
May 17th - World Hypertension Day
May 17th - International Day Against Homophobia and Transphobia
May 17th - World Pastry Day
May 18th - International Museum Day
May 18th - World AIDS Vaccine Day
May 18th - International Day of the Fascination of Plants
May 19th - World Family Doctor's Day
May 20th - World Bee Day
May 20th - International Day of Virtual Assistants
May 20th - World Metrology Day
May 21th - World Day for Cultural Diversity for Dialogue and Development
May 21th - National Day to Fight Obesity
May 21th - World Whiskey Day
May 21th - International Tea Day
May 21th - World Fish Migration Day
May 22th - International Day for Biological Diversity
May 23th - International Day for the End of Obstetric Fistula
May 23th - World Turtle Day
May 25th - International Missing Children's Day
May 28th - International Women's Health Day
May 28th - International Play Day
May 29th - International Day of UN Peacekeepers
May 29th - National Energy Day
May 29th - World Digestive Health Day
May 30th - World Multiple Sclerosis Day
May 31th - World No Tobacco Day
JUNE
June 1st - Father's Day
June 1st - World Children's Day
June 3rd - World Bike Day
June 4th - International Day of Innocent Children Victims of Assault
June 5th - World Environment Day
June 5th - International Day to Combat Illegal, Unreported and Unregulated Fishing
June 6th - Russian Language Day
June 7th - World Food Safety Day
June 8th - World Oceans Day
June 9th - International Archives Day
June 12th - World Day Against Child Labor
June 13th - World Albinism Awareness Day
June 14th - World Blood Donor Day
June 15th - World Violence Awareness Day against Older Persons
June 15th - World Wind Day
June 16th - International Day of the African Child
June 16th - International Family Remittance Day
June 17th - World Day to Combat Desertification and Drought
June 18th - Sustainable Gastronomy Day
June 18th - International Sushi Day
June 18th - International Picnic Day
June 18th - International Panic Day
June 18th - World Juggling Day
June 18th - Autistic Pride Day
June 19th - International Day for the Elimination of Sexual Violence in Conflict
June 19th - World Sickle Cell Disease Awareness Day
June 20th - World Refugee Day
June 20th - World Productivity Day
June 21th - International Yoga Day
June 21th - World Giraffe Day
June 21th - World Humanist Day
June 23th - United Nations Public Service Day
June 23th - International Day of Widows
June 25th - World Vitiligo Day
June 25th - World Sailor's Day
June 26th - International Day against Drug Abuse and Illicit Trafficking
June 26th - International Day of Support for Victims of Torture
June 27th - Micro, Small and Medium Enterprises Day
June 28th - International Body Piercing Day
June 29th - International Day of the Tropics
June 29th - International Mud Day
June 30th - International Asteroid Day
June 30th - International Parliamentarianism Day
June 30th - World Social Media Day
JULY
July 1st - World Rescue Day
July 1st - World Library Day
July 1st - International Joke Day
July 2nd - World UFO Day
July 3rd - International Plastic Bag Free Day
July 3rd - World Naturism Day
July 5th - World Bikini Day
July 6th - International Day of Cooperatives
July 7th - World Chocolate Day
July 8th - World Allergy Day
July 9th - World Disarmament Day
July 10th - World Pizza Day
July 11th - World Population Day
July 13th - World Rock Day
July 14th - World Freedom of Thought Day
July 15th - World Youth Skills Day
July 16th - World Snake Day
July 17th - World Day of International Justice
July 18th - International Nelson Mandela Day
July 22th - World Brain Day
July 25th - World Drowning Day
July 26th - World Grandparents Day
July 28th - World Hepatitis Day
July 28th - World Day for Nature Conservation
July 29th - International Tiger Day
July 30th - International Friendship Day
July 30th - International Day of the Friend
July 30th - World Day against Trafficking in Persons
July 31th - World Day of the Nature Watcher
AUGUST
August 5th - International Beer Day
August 8th - World Cat Day
August 9th - International Day of Indigenous Peoples
August 10th - World Lion Day
August 12th - International Youth Day
August 12th - World Elephant Day
August 13th - World Left-handed Day
August 19th - World Humanitarian Day
August 19th - World Photography Day
August 20th - International Day of the Homeless Animal
August 20th - World Mosquito Day
August 21th - International Day of Remembrance and Tribute to Victims of Terrorism
August 23th - International Day in Remembrance of the Slave Trade and its Abolition
August 24th - International Strange Music Day
August 24th - World Artist Day
August 26th - International Women's Equality Day
August 26th - World Dog Day