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

Other days

kiss a ginger

Kiss A Ginger Day
lisp

Lisp Day
kiss a brunette

Kiss A Brunette Day
buddy

Buddy Day
one

One Day
slime

Slime Day
gum

Gum Day
self care

Self Care Day
girl friend

Girl Friend Day
pumpkin

Pumpkin Day