Oops, it doesn't look like 'let the titties loose day' is a national day..

Other days

slime

Slime Day
tell a fairytale

Tell A Fairytale Day
law

Law Day
offer

Offer Day
kale

Kale Day
ruby

Ruby Day
youth

Youth Day
cuddle up

Cuddle Up Day
stud

Stud Day
nail polish

Nail Polish Day