European Cooperation Day
European Cooperation Day is held on September 21. This event in the third decade of the month September is annual. 
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Europe is a mix of cultures and economies that need to understand each other in order to reach their maximum potential. We commemorate the European Cooperation Day (also known as “EC Day”) on 21 September every year.
Source: ecday.eu
Similar holidays and events, festivals and interesting facts
International Day of University Sport on September 20
World Alzheimer's Day on September 21
World Gratitude Day on September 21 (First celebrated in 1965);
Feast of the Nativity of the Virgin on September 21 (Orthodox Church);
International Day of Struggle against Monoculture Tree Plantations on September 21
World Protection Elephant Day 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);
World Rhino Day on September 22
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
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