International Suit Up Day
International Suit Up Day is held on October 13. This event in the second decade of the month October is annual. 
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Suits are a time-honored convention of menswear. Short of jackhammers and beer, they’re the ultimate expression of masculinity and simply have the ability to make every man look dapper and suave. Once upon a time in ancient Persia, merchants were like today’s executives and had to be the best-dressed to symbolize their affluence and wealth. Fashion has come a long way – today we have the power suit.
In honor of Barney Stinson' love for suits, it was announced by fans on October 13th, 2010, that October 13th of every year, is International Suit Up Day. More than 700,000 people worldwide committed to wear suits on that day on Facebook. Barnabus Stinson is a fictional character portrayed by Neil Patrick Harris and created by Carter Bays and Craig Thomas for the CBS television series How I Met Your Mother (2005-2014).
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 Skeptics 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