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

Other days

gum

Gum Day
first love

First Love Day
ruby

Ruby Day
slime

Slime Day
singles

Singles Day
kale

Kale Day
camera

Camera Day
hiv awareness

Hiv Awareness Day
ride the wind

Ride The Wind Day
boy friend

Boy Friend Day