World Cleanup Day
World Cleanup Day is held on September 16. The third Saturday of September. This event in the second decade of the month September is annual. 
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World Cleanup Day is celebrated with litter cleanup and waste mapping activities spanning every time zone. Environmental cleanup events are held in nearly every country until concluding near the international date line in Hawaii and American Samoa.
Similar holidays and events, festivals and interesting facts
International Dot Day on September 15
International Day for Freedom of Education on September 15
International Grenache Day on September 15 (Celebrated on the 3rd Friday in September);
European Prostate Health Day on September 15
Greenpeace Birthday on September 15 (an international independent non-governmental environmental organization established in 1971 in Canada);
World Marrow Donor Day on September 16 (is celebrated globally on the third Saturday of September);
International Eat An Apple Day on September 16 (Third Saturday of Septembe);
European Mobility Week on September 16
International Coastal Cleanup Day on September 16 (Held on the third weekend of September);
The beginning of the European Union Mobility Week on September 16
World Patient Safety Day on September 17
International Guinep Day on September 17
International Country Music Day on September 17
World Educational Psychologist Day on September 17
World Kleefstra Syndrome Day on September 17