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

Other days

ormille

Ormille Day
believe

Believe Day
my little pony

My Little Pony Day
boy friend

Boy Friend Day
frozen yogurt

Frozen Yogurt Day
lumpy rug

Lumpy Rug Day
gum

Gum Day
ponytail

Ponytail Day
lisp

Lisp Day
bounce

Bounce Day