World Rhino Day

World Alzheimer's Day on September 21;

World Gratitude Day on September 21 (First celebrated in 1965);

European Cooperation Day on September 21;

Feast of the Nativity of the Virgin on September 21 (Orthodox Church);

International Day of Struggle against Monoculture Tree Plantations on September 21;

Zero Emissions Day on September 21;

Arbor Day in Brazil on September 21;

World Protection Elephant Day on September 22;

National Elephant Appreciation Day in USA on September 22;

World CML Day on September 22 (Since 2008, patient organizations around the world have initiated events and projects on "CML Awareness Day" on September 22 to raise awareness of the needs of patients living with Chronic Myeloid Leukemia);

International Mixed Berries Muffin Day on September 22;

Astronomy Day on September 22 (autumn);

World Rose Day on September 22;

International Mime Day on September 22;

International Rabbit Day on September 23 (Held on the fourth Saturday in September);

Dogs in Politics Day on September 23;

Day of Combating the Non-Completion of Secondary School Children on September 23;

International Day against Sexual Exploitation and Trafficking of Women and Children on September 23 (is celebrated every 23 September. It was jointly established by the World Conference of the Coalition against Trafficking in Persons and the Women’s Conference that took place in January 1999 in Dhaka, Bangladesh);

International Day of Sign Languages on September 23 (adopted by the UN on November 14, 2017);

European Mushroom Day on September 23 (Celebrated on the fourth Saturday of September);

National Public Lands Day in USA on September 23 (Held on the fourth Saturday in September)