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

Other days

stud

Stud Day
lumpy rug

Lumpy Rug Day
tell a fairytale

Tell A Fairytale Day
boy friend

Boy Friend Day
blanket fort

Blanket Fort Day
ruby

Ruby Day
lisp

Lisp Day
healing

Healing Day
believe

Believe Day
pumpkin

Pumpkin Day