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

Other days

ruby

Ruby Day
pumpkin

Pumpkin Day
mean girls

Mean Girls Day
book

Book Day
unicorn

Unicorn Day
hoodie

Hoodie Day
hannah

Hannah Day
eat what you want

Eat What You Want Day
kiss a ginger

Kiss A Ginger Day
buddy

Buddy Day