Oops, it doesn't look like 'prevent plagiarism day' is a national day..

Other days

carpenters

Carpenters Day
lumpy rug

Lumpy Rug Day
aloxolt

Aloxolt Day
self appreciation

Self Appreciation Day
ruby

Ruby Day
lisp

Lisp Day
china

China Day
self care

Self Care Day
hannah

Hannah Day
buddy

Buddy Day