Wear Your Pajamas To Work Day
Wear Your Pajamas To Work Day is held on April 16. This event in the second decade of the month April is annual. 
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The term pajama is derived from the Hindi words pae jama, which meaning leg clothes or leg garment. Only monarchs and others of high origin wore it during the Middle Ages. Pajams, payjamas, or jammies is a loose piece of clothing, not unlike pants, worn on the lower part of a person's body. National Wear Your Pajamas To Work Day is celebrated on April 16th and encourages everyone to go to work while wearing their favorite pair of pajamas.
Similar holidays and events, festivals and interesting facts
Rubber Eraser Day on April 15 (Joseph Priestley discovered the eraser in 1770, using pieces of rubber imported from Brazil. Then in 1858, Hyman Lipman of Philadelphia, Pa., patented the pencil with an eraser at the end);
Take A Wild Guess Day on April 15
Stoker's Day on April 15 (is celebrated in spring, at the end of the heating season. All shifts workers gether in the boiler room to extinguish the boilers and begin to celebrate. The date of this celebration is not fixed. The local authorities decide when to start and when to finish the heating season but usually it hapends not later than April 30 if the average air temperature is above +8 for 3 days in a raw);
Foursquare Day on April 16
National Tickle Day in USA on April 16
Bat Appreciation Day on April 17
Blah Blah Blah Day on April 17 (is the opportunity to stop procrastinating and get to grips with all those stalled projects and broken promises right now);
Ford Mustang Day on April 17 (The Ford Mustang was first introduced to the world in April of 1964);
Haiku Poetry Day on April 17
Kickball Day on April 17