Marine Day or Ocean Day or Sea Day in Japan
Marine Day or Ocean Day or Sea Day in Japan is held on July 15. It is a Japanese national holiday celebrated on the third Monday in July. This event in the second decade of the month July is annual. 
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Sea Day traces its roots back to 1876, when the Meiji Emperor took a voyage on a ship through the Tohoku Region. It ended on the 20th of July. In 1941, July 20th was named Marine Memorial Day in commemoration of that trip. It only became a national holiday in 1995.
Similar holidays and events, festivals and interesting facts
Nachi Fire Festival in Japan on July 14 (Nachi-no-Ogi Matsuri);
Bon Festival on July 15 (Kantō region, Japan);
Gion Matsuri in Kyoto, Japan on July 17 (祇園祭 is one of the most famous festivals. It lasts all of July and ends with the Yamaboko Junkō parade on July 17 and 24. Initially, it was dedicated to fighting the plague in 869);
One Piece Day on July 22
Letter Writing Day in Japan on July 23 (The Letter Writing Day can be a bit confusing... as we found on numerous sites that this 'holiday' falls on 7th of December, then again on the official World Letter Writing Day page the date is 1st of September, and Japan issues LWD stamps each year, for over two decades now, on 23rd of July. In any case, its a nice way of reminding people of the existence of letters);
Tenjin Matsuri in Osaka, Japan on July 25 (colorful festival);
Yurei no Hi in Japan on July 26