For Pete's Sake Day
For Pete's Sake Day is held on February 26. If there’s a Pete in your life, why not do something for his sake?. This event in the third decade of the month February is annual. 
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It was started by a former Lebanese radio talk show host, Pa., Tom Roy and his wife, Ruth. For Pete's Sake Day is celebrated 'minced oaths' — an offensive word or phrase is substituted by a polite phrase. Some examples of a minced oath are “gosh” for God, “heck” for hell, etc.
According to the Oxford English Dictionary, "for Pete's sake" was used more than a century ago and makes up similar expressions to "for the love of Pete" in 1906 and "in the name of Pete" in 1942.
According to some research, it is believed that this idiom “Pete’s Sake” was created to substitute a profane expression. It is created to substitute the phrase “for Christ’s sake” or “for God’s sake”, as in the middle ages this phrase is considered profane.
Similar holidays and events, festivals and interesting facts
Pistol Patent Day on February 25 (Samuel Colt invented the pistol. He received Patent # 138 for it on this day in 1836. The patent was for the Colt Revolver with a rotating chamber containing six bullets);
World Spay Day on February 25 (Last Tuesday in February);
Personal Chef Day on February 26
Carnival Day on February 26
Tell a Fairy Tale Day on February 26
Inconvenience Yourself Day on February 26 (is celebrated on the fourth Wednesday of February of every year);
No Brainer Day on February 27 (This day was created by Adrienne Sioux Koopersmith, 'America's Premier Eventologist' - per Insight Magazine - Washington, DC - August, 1995, and 'The Premier Eventologist in the History of the World - per The Chicago Tribune - Chicago, Il - January 2001);
The Fools' Court in Stockach on February 27 (political spectacle for 660 years)