5.25" Floppy Day
5.25" Floppy Day is held on May 5. #525FloppyDay. This event in the first decade of the month May is annual. 
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The 5.25-inch floppy disk was the successor to the 8-inch floppy disk and served as the dominant portable storage medium during the late 1970s and throughout the 1980s. It was developed in 1976 and was similar in capacity to the 8-inch floppy disk but used high-density media and recording techniques.
Similar holidays and events, festivals and interesting facts
World Laughter Day on May 4 (was created in 1998 by Dr. Madan Kataria, founder of th worldwide Laughter Yoga movemen);
Join Hands Day on May 4
Petite And Proud Day on May 4
Renewal Day on May 4
Star Wars Day on May 4 (International observance);
Cartoonists Day on May 5 (They were the favorite part of the morning paper for many of us growing up);
Cinco de Meow Day on May 5
OMR Festival in Hamburg on May 6
No Homework Day on May 6 (this is the day where children can tell their teachers and parents in complete honesty that they will not be doing their homework, in order to mark this special day);
Coloring Day on May 6