Garbage Day in Japan
Garbage Day in Japan is held on May 3. Gomi No Hi. This event in the first decade of the month May is annual. 
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Be extra careful with recycling on that day, because 5 (go) and 3 (mi) makes up the Japanese word for garbage, gomi, and your neighbors will be watching.
Similar holidays and events, festivals and interesting facts
Spring Decade of Birdwatching on May 1 (May 1-10);
Green Up Day in Vermont on May 3 (observed on the first Saturday of May, is a statewide effort in the US state of Vermont to clean up roadside trash);
Greenery Day in Japan on May 4 (みどりの日 - Until 1988, April 29 was celebrated as the birthday of Emperor Showa. It was decided to keep this day a holiday even after his passing away in January 1989 and to name it Greenery Day because of the late Emperor's love of nature. In 2007, April 29 became Showa Day, and Greenery Day was moved to May 4);
National Air Quality Awareness Week in USA on May 5 (Starts on the first Monday in May);
World Cactus Day on May 10
International Argania Day on May 10
Herb Weeks on Western Lake Constance on May 10