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

Other days

cursing

Cursing Day
stud

Stud Day
bow tie

Bow Tie Day
blanket fort

Blanket Fort Day
mean girls

Mean Girls Day
eat what you want

Eat What You Want Day
pampering

Pampering Day
believe

Believe Day
lisp

Lisp Day
gum

Gum Day