International Day of Cleaning Water Reservoirs
International Day of Cleaning Water Reservoirs is held on June 6. Celebrated since 1995. This event in the first decade of the month June is annual. 
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This event in many countries of the world since 1995 has been held annually under the leadership of PADI (Professional Association of Diving Instructors - Professional Association of Diving Instructors, which was founded in 1966). On this day, many diving clubs organize trips to local water bodies, where the coastal strip and the bottom are cleaned by scuba divers and coastal support groups.
Similar holidays and events, festivals and interesting facts
World Day Against Speciesism on June 5
International Day for the Fight Against Illegal, Unreported and Unregulated Fishing on June 5 (UN 2017);
European Dental Technicians Day on June 5 (Celebrated on the first Friday of June);
World Donut Day on June 5 (Celebrated on the first Friday of June);
Ecologist Day in Kazakhstan and Russia on June 5
Arbor Day in New Zealand on June 5
National Black Bear Day in the USA on June 6 (Held on the first Saturday in June);
World Day of Verneuil's disease on June 6 (or World Day for Hidradenitis Suppurativa);
World Transplant Day on June 6
Pet Appreciation Week on June 7 (First Full Week in June);
International Cancer Survivors Day on June 7 (Date for 2025);
World Food Safety Day on June 7 (A/RES/73/250);
World Parkour Day on June 7
World Tourette Syndrome Awareness Day on June 7
World Naturist Day on June 7 (Starts on the first Sunday of June in the northern hemisphere and on the first Sunday of December in the southern hemisphere)