World NGO Day
World NGO Day is held on February 27. This event in the third decade of the month February is annual. 
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Bangladesh Rural Advancement Committee (BRAC) is the largest non-governmental development organisation in the world, in terms of number of employees as of September 2016.
The first international NGO was probably the Anti-Slavery Society, formed in 1839. The anti-slavery movement, which reached its height at the end of the 18th century, was the catalyst for many organisations that followed.
First time marked officially by the UN, EU leaders and international organizations in 2014. The Global Inaugural event of World NGO day was hosted by the Ministry for Foreign Affairs of Finland on 27th of February 2014 in Helsinki, Finland.
Similar holidays and events, festivals and interesting facts
World Pistachio Day on February 26
Anosmia Awareness Day on February 27 (International observance);
World Tailors Day on February 28 (international);
World Day without Facebook on February 28 (organized by Facebook users to inform the administration of the social network about cyber addiction and intrusions in privacy);
World Seagrass Day on March 1
World Compliment Day on March 1 (appeared after many successful editions of “National Compliment Day” in the Netherlands);
World Civil Defence Day on March 1