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

Other days

kale

Kale Day
unicorn

Unicorn Day
china

China Day
hiv awareness

Hiv Awareness Day
book

Book Day
kiss a ginger

Kiss A Ginger Day
mean girls

Mean Girls Day
bounce

Bounce Day
gum

Gum Day
slime

Slime Day