Island Language Day
Island Language Day is held on September 18. Okinawa Prefecture, Japan. This event in the second decade of the month September is annual. 
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Known as the “Hawaii of Japan”, Okinawa has amazing star-gazing, diving, a unique cuisine and yes, cherry blossoms too.
The Okinawan language or Central Okinawan, is a Northern Ryukyuan language spoken primarily in the southern half of the island of Okinawa, as well as in the surrounding islands of Kerama, Kumejima, Tonaki, Aguni and a number of smaller peripheral islands.
Even within the language, there are several dialects spoken within the southern half of Okinawa Island. Such differences exist for all the six different languages — including forms spoken on Amami-Oshima, Yaeyama, Miyako and other islands in the southwest — designated as endangered by UNESCO.
Similar holidays and events, festivals and interesting facts
Respect for the Aged Day on September 15 (Japan, celebrated on the third Monday in September);
Shu-bun-no Hi in Japan on September 23
Honda Motor Day on September 24
10-yen Curry Day in Japan on September 25 (Juen Kare No Hi);
Cleaning Day in Japan on September 29 (Kuriningu No Hi);
National Coffee Day in Japan and Sri Lanka on October 1
Seasonal Change of Clothing in Japan on October 1 (Koromogae);
Mitsubishi UFJ Financial Day on October 1