Oops, it doesn't look like 'fuck your friends ex bf day' is a national day..

Other days

tulip

Tulip Day
brow

Brow Day
china

China Day
stud

Stud Day
get funky

Get Funky Day
lisp

Lisp Day
cat girl

Cat Girl Day
aloxolt

Aloxolt Day
azonto is acceptable

Azonto Is Acceptable Day
one

One Day