CSS Reboot Day
CSS Reboot Day is held on May 1. This event in the first decade of the month May is annual. 
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The initial inspiration for CSS Reboot came first from the May 1 Reboot, an idea and event originally conceived by James Widegren in 2000, now directed by Paul A. Szypula. The May 1st reboot was a great event that CSS Reboot had in abundance.
Similar holidays and events, festivals and interesting facts
Hairstyle Appreciation Day on April 30
World Password Day on May 1 (first Thursday of May);
School Principals' Day on May 1 (if you don’t have a good principal, you won’t have a good school);
Global Love Day on May 1
Lei Day on May 1 (the event started in 1927 at the bank of Hawaii);
Mother Goose Day on May 1 (The term "Mother Goose" dates back to the 1650's);
New Home Owners Day on May 1
Save the Rhino Day on May 1
Ferret Day on May 2
Baby Day on May 2 (is the first ever statewide celebration of the first three years, when early experiences shape livelong potential);
No Pants Day on May 2 (It is held on the first Friday in May);
Harry Potter Day on May 2