Flip-Flop Day
Flip-Flop Day is held on June 18. Annually in Third Friday Of June. This event in the second decade of the month June is annual. 
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Flip flops have been worn across the globe and throughout history. It is estimated that flip-flops were first used around 4,000 B.C, according to Ancient Egyptian murals. However, the first documented account of flip-flops being worn is from 15,000 years ago during the Stone Age.
The National Flip Flop Day was created by Tropical Smoothie Café in the year 2007 to celebrate its 10th anniversary. On this day, customers can walk in and get a Jetty Punch smoothie for free wearing a flip flop. The charity and proceeds collected on this day are sent to Camp Sunshine, a place treating life-threatening illnesses and their effects on family members.
The flip flop as we know it today is modeled off the Japanese zōri: many US soldiers returned from World War II with these shoes, and the rest of the country jumped on board with the trend. Not everyone is a fan of flip flops: they are the bane of many a podiatrist’s existence.
Similar holidays and events, festivals and interesting facts
Dump The Pump Day on June 17 (Third Thursday of June);
National Seersucker Day in US on June 17
International Panic Day on June 18 (Don't worry. Don't fret. and, above all, don't panic);
Go Fishing Day on June 18
International Picnic Day on June 18
Splurge Day on June 18
Garfield The Cat Day on June 19 (Garfield was famously created by cartoonist Jim Davis and appeared in a cartoon strip on 19th June 1978);
International Surfing Day on June 19 (was established in 2005 by Surfing Magazine and The Surfrider Foundation);
World Sauntering Day on June 19 (The holiday was created in 1979 by W.T. Rabe in response to the growing popularity of jogging. It is believed to have begun at the Grand Hotel on Mackinac Island in Michigan, USA. The Grand Hotel has the world's longest porch at 660 feet. The idea behind the day was to encourage people to slow down and appreciate the world around them);
US Hollerin' Contest Day on June 19
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