Oops, it doesn't look like 'send w a nude day' is a national day..

Other days

ruby

Ruby Day
girl friend

Girl Friend Day
tulip

Tulip Day
believe

Believe Day
blanket fort

Blanket Fort Day
nae nae

Nae Nae Day
lisp

Lisp Day
book

Book Day
coffee

Coffee Day
stud

Stud Day