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

Other days

ruby

Ruby Day
book

Book Day
ride the wind

Ride The Wind Day
polyamory

Polyamory Day
bonang

Bonang Day
boy friend

Boy Friend Day
cuddle up

Cuddle Up Day
believe

Believe Day
blanket fort

Blanket Fort Day
one

One Day