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

Other days

gallery

Gallery Day
tell a fairytale

Tell A Fairytale Day
pumpkin

Pumpkin Day
bow tie

Bow Tie Day
kiss a ginger

Kiss A Ginger Day
boy friend

Boy Friend Day
hoodie

Hoodie Day
brow

Brow Day
first love

First Love Day
coffee

Coffee Day