(a) International Day of the World’s Indigenous Peoples
(b) International Mother Language Day
(c) International Talk Like a Pirate Day (September 19th)
(d) World Tourism Day

(a) Dangers of nuclear weapons
(b) International Day for the Abolition of Slavery (December 2nd) (The bombing is used to highlight the importance of abolishing all forms of violence)
(c) Importance of peace treaties
(d) International Day of Peace

(a) International Women’s Day
(b) Valentine’s Day (February 14th) (for singles)
(c) International Day of Happiness
(d) International Day of Families

(a) World Environment Day
(b) Earth Hour (Last Saturday of March)
(c) World Wildlife Day
(d) International Day of Forests

(a) World Down Syndrome Day
(b) World Down Syndrome Day (March 21st)
(c) International Day of People with Disabilities
(d) International Day of Persons with Albinism (June 13th)

(a) World Happiness Day
(b) International Laughter Day (First Sunday of May)
(c) International Day of Peace
(d) International Day of Sport for Development and Peace

(a) World Refugee Day
(b) International Day of Stateless Persons (November 4th)
(c) International Day of the World’s Indigenous Peoples
(d) World Humanitarian Day

(a) World Day for Cultural Diversity
(b) International Day for the Eradication of Poverty
(c) World Science Day for Peace and Development (November 10th)
(d) International Day of Women and Girls in Science

(a) World Health Day
(b) World Water Day (March 22nd)
(c) World Environment Day
(d) International Day for Biological Diversity

(a) International Day of Space Exploration
(b) Space Day (July 20th)
(c) World Telecommunication and Information Society Day
(d) International Day of Astronomy