Oops, it doesn't look like 'ignore me all day' is a national day..

Other days

kale

Kale Day
kiss a ginger

Kiss A Ginger Day
offer

Offer Day
kiss a brunette

Kiss A Brunette Day
law

Law Day
donate your hair

Donate Your Hair Day
lisp

Lisp Day
gum

Gum Day
ruby

Ruby Day
mean girls

Mean Girls Day