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

Other days

martini

Martini Day
gum

Gum Day
camera

Camera Day
boy friend

Boy Friend Day
brow

Brow Day
hiv awareness

Hiv Awareness Day
bow tie

Bow Tie Day
one

One Day
hot chocolate

Hot Chocolate Day
kiss a ginger

Kiss A Ginger Day