Oops, it doesn't look like 'eat the booty day' is a national day..

Other days

lisp

Lisp Day
stud

Stud Day
cuddle up

Cuddle Up Day
fiancee

Fiancee Day
kale

Kale Day
one

One Day
bubble bath

Bubble Bath Day
youth

Youth Day
polyamory

Polyamory Day
unicorn

Unicorn Day