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

Other days

lisp

Lisp Day
lash

Lash Day
eat what you want

Eat What You Want Day
ask out your crush

Ask Out Your Crush Day
nail polish

Nail Polish Day
one

One Day
pick me

Pick Me Day
lost sock memorial

Lost Sock Memorial Day
ruby

Ruby Day
me

Me Day