International Skeptics Day
International Skeptics Day is held on October 13. This event in the second decade of the month October is annual. 
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Do you question everything and never accept things at their face value? Then, International Skeptics Day on October 13 is the holiday for you. Question everything on International Skeptics Day. This unofficial holiday is sometimes also celebrated on January 13.
A questioning mind is as fundamental to human progress as the scientific method. Empiricism and most of the West’s legal philosophies have roots in a combination of naturalist and contrarian principles.
Similar holidays and events, festivals and interesting facts
World Bone and Joint Week on October 12
World Economist Day on October 12 (the day when outstanding representatives of the profession are awarded a prize by decision of the Nobel Committee);
International Day Against DRM on October 12 (IDAD, Inaugurated 2006);
World Algae Day on October 12
Moment of Frustration Day on October 12 (is the opportunity to let your frustrations out);
Old Farmers Day in USA on October 12
Diver's Day on October 12
International Suit Up Day on October 13
World Thrombosis Day on October 13
No Bra Day on October 13 (On this day women are encouraged to forgo wearing no bra as a means to encourage breast cancer awareness);
Face Your Fears Day on October 13 (they might be afraid of you);
World Zombie Day on October 13
International Environmental Education Day on October 14 (established in 1991);
World Spirometry Day on October 14
Be Bald And Free Day on October 14
Bring Your Teddy Bear To Work & School Day on October 14 (Held on the second Wednesday of October);
National Graffiti Appreciation Day in USA on October 14