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

Other days

healing

Healing Day
ponytail

Ponytail Day
cat girl

Cat Girl Day
my little pony

My Little Pony Day
cursing

Cursing Day
bow tie

Bow Tie Day
first love

First Love Day
pumpkin

Pumpkin Day
boy friend

Boy Friend Day
girl friend

Girl Friend Day