International Basque Language Day
International Basque Language Day is held on December 3. Euskara. This event in the first decade of the month December is annual. 
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The date of this holiday was established in 1948 by Eusko Ikaskuntza, the Society for Basque Studies.
Basque seems to pre-date Latin, but its origins are relatively unknown. Basque is what is considered a “language isolate.” It is surrounded by French and Spanish speakers but does not share an origin with them. In fact, linguists believe that Basque is the oldest language in Europe. It is considered a “pre-Indo-European” language, meaning it developed in prehistoric times.
It is unique in that it does not seem to be related to any other language in the area. No one is really sure how it developed or where it came from, and it is cherished by the Basque culture for its uniqueness.
Similar holidays and events, festivals and interesting facts
International Model Railroad Day on December 2
Cyber Monday on December 2 (the online version of Black Friday, where online retailers offered big discounts to match their brick-and-mortar counterparts);
World Futures Day on December 2
Doctor and Medicine Day in Latin America on December 3 (Día del médico y la Médica);
International Medical Day on December 3
International 3D Day on December 3
International Cheetah Day on December 4
International Banking Day on December 4