Each year on the third Thursday in April, we observe National High Five Day. This is a fun day where you can “High Five” everyone that you see.
History
In 2002, college students at the University of Virginia, Conor Lastowka (San Diego, CA), Sam Miotke (Corvallis, OR) and Wynn Walent (New York, NY) together created National High Five Day, an unofficial national holiday.
The National High-5-A-Thon For Cancer Research: http://www.nationalhighfiveproject.org/
High Five Background (Wikipedia):
The high five is a hand gesture that occurs when two people simultaneously raise one hand each, about head-high, and push, slide, or slap the flat of their palm against the flat palm of the other person. The gesture is often preceded verbally by a phrase like “Give me five” or “High five.” Its meaning varies with the context of use but can include as a greeting, congratulations or celebration.
There are many origin stories of the high five, but the two most documented candidates are Dusty Baker and Glenn Burke of the Los Angeles Dodgers professional baseball team on October 2, 1977, and Wiley Brown and Derek Smith of the Louisville Cardinals men’s college basketball team during the 1978–1979 season.
In the United States, there is a private initiative to celebrate the third Thursday of April as National High Five Day.