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

Other days

lisp

Lisp Day
girl friend

Girl Friend Day
kiss a ginger

Kiss A Ginger Day
boy friend

Boy Friend Day
believe

Believe Day
hiv awareness

Hiv Awareness Day
nail polish

Nail Polish Day
hannah

Hannah Day
artists

Artists Day
gum

Gum Day