Oops, it doesn't look like 'fuck your stupid day' is a national day..

Other days

bonang

Bonang Day
lisp

Lisp Day
china

China Day
slime

Slime Day
blanket fort

Blanket Fort Day
self appreciation

Self Appreciation Day
aloxolt

Aloxolt Day
one

One Day
ruby

Ruby Day
tulip

Tulip Day