Oops, it doesn't look like 'champ in one day' is a national day..

Other days

gum

Gum Day
pick me

Pick Me Day
brow

Brow Day
tulip

Tulip Day
cuddle up

Cuddle Up Day
ask out your crush

Ask Out Your Crush Day
kiss a brunette

Kiss A Brunette Day
first love

First Love Day
lisp

Lisp Day
boyfriend

Boyfriend Day