(June 26, 2018) The Tokyo Olympic and Paralympic Special Measures Act (Act No. 33 of 2015) was amended on June 20, 2018. (Act to Amend the Tokyo Olympic and Paralympic Special Measures Act, Act No. of 2018, Kanpou Special Ed. No. 132, at 5 (June 20, 2018) (in Japanese).)
Under the new Act, the dates of three national holidays will be moved to reduce traffic congestion and promote security at the Olympic ceremonies in 2020. (Tokyo Olympic and Paralympic Special Measures Act, new art. 29.) The three holidays are Physical Fitness Day, usually the second Monday of October; Marine Day, normally the third Monday of July; and Mountain Day, which falls every year on August 11.
According to the new Act, Physical Fitness Day will be moved to the day of the Tokyo Olympic opening ceremony—Friday, July 24, 2020. Marine Day will be changed to the day prior to the opening ceremony, July 23. Finally, Mountain Day will be shifted to August 10, 2020, the day after the closing ceremony. (Japan Enacts Law to Move Holidays to Ease Traffic for 2020 Olympics, MAINICHI JAPAN (June 13, 2018).)