National Public Lands Day in USA
National Public Lands Day in USA is held on September 27. Held on the fourth Saturday in September. This event in the third decade of the month September is annual. 
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National Public Lands Day is organized annually and led by the National Environmental Education Foundation, in partnership with the National Park Service and other federal agencies.
Established in 1994 and held annually on the fourth Saturday in September, National Public Lands Day is traditionally the nation's largest single-day volunteer effort. It celebrates the connection between people and green space in their community, inspires environmental stewardship, and encourages use of open space for education, recreation, and health benefits.
Similar holidays and events, festivals and interesting facts
World Environmental Health Day on September 26
National Crush Day in USA on September 27 (It’s a reminder that recycling reduces carbon emissions, saves money, and cuts down on waste. National Crush Day is an opportunity for those who care about the environment to advocate for recycling);
European Mushroom Day on September 27 (Celebrated on the fourth Saturday of September);
International Rabbit Day on September 27 (Held on the fourth Saturday in September);
National Environmental Awareness Day in Argentina on September 27
World Rivers Day on September 28 (last Sunday of September);
Junk Mail Awareness Week on October 1 (Junk mail isn't just annoying. Take a day to think about that and maybe take some action - sign up for Do Not Mail lists, or post a note on your mailbox declaring it a junk mail-free zone);
Day of the Sea and Fishing Wealth in Argentina on October 1
National Tree Day in Bolivia on October 1
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