Mountain Day in Japan
Mountain Day in Japan is held on August 11. 山の日 - The legislation states that the holiday is to provide “opportunities to get familiar with mountains and appreciate blessings from mountains.”. This event in the second decade of the month August is annual. 
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The legislation states that the holiday is to provide "opportunities to get familiar with mountains and appreciate blessings from mountains." As special arrangement for the 2020 Summer Olympics, the 2020 date for Mountain Day was moved to August 10.
They did have a point, given Japan's 100 active volcanoes, more than 3,000 hot springs, and even 5,000 earthquakes a year that is connected, in one way or another, to the mountains and tectonic plate movement. Mt Fuji is actually a Stratovolcano! Not only is it one volcano – it's three!
Similar holidays and events, festivals and interesting facts
Japan Hug Day on August 9
Nagasaki Memorial Day in Japan on August 9 (Nagasaki Peace Park is a park located in Nagasaki, Japan, commemorating the atomic bombing of the city on August 9, 1945 during World War II);
Mushroom Day in Japan on August 11
National Anthem Japan - Kimi Ga Yo on August 12
Obon in the east in Japan on August 13 (celebrated until August 15);
Barefoot Anniversary Day or Hadashi no Kinbi in Japan on August 14
Happy Summer Valentines Day on August 14