Oops, it doesn't look like 'Knuck If You Buck day' is a national day..

Other days

carpenters

Carpenters Day
kale

Kale Day
believe

Believe Day
unicorn

Unicorn Day
hannah

Hannah Day
china

China Day
lisp

Lisp Day
ruby

Ruby Day
kiss a ginger

Kiss A Ginger Day
boy friend

Boy Friend Day