Dialect Day
Dialect Day is held on February 18. Amami Islands, Japan. This event in the second decade of the month February is annual. 
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The Ryukyuan peoples are of Japanese and southeast Asian descent. Their languages vary from island to island and their dialects from village to village. The Amami languages (島口, Shimayumuta) are a collection of dialect clusters spoken across the Amami Islands of Kagoshima Prefecture, Japan.
Most Amami speakers are elderly, and younger Amami locals mainly speak Japanese.
Similar holidays and events, festivals and interesting facts
Hachinohe Enburi in Japan on February 17 (is a traditional local dance festival where they welcome the arrival of spring and pray for a rich harvest in Aomori, Japan. みちのく五大雪まつり);
International Sylveon Day on February 21
Cat Day in Japan on February 22
The Emperor's Birthday in Japan on February 23 (birthday of Naruhito, the current Emperor of Japan);
Kitano Baika-sai or "Plum Blossom Festival" on February 25 (Kitano Tenman-gū Shrine, Kyoto, Japan);
National Day of Struggle for Peace or Bikini Day in Japan on March 1
Omizu-tori in Japan on March 1 (お水取り or “Getting Water” is a Buddhist festival that takes place in the Nigatsu-do Temple, which is part of the Todai-ji Temple, located in the city of Nara, celebrated from March 1-14)