Oops, it doesn't look like 'flag on all day' is a national day..

Other days

carpenters

Carpenters Day
hiv awareness

Hiv Awareness Day
boy friend

Boy Friend Day
one

One Day
bow tie

Bow Tie Day
hoodie

Hoodie Day
brow

Brow Day
youth

Youth Day
kale

Kale Day
believe

Believe Day