Oops, it doesn't look like 'fuck howard stark day' is a national day..

Other days

prosecco

Prosecco Day
blanket fort

Blanket Fort Day
buddy

Buddy Day
youth

Youth Day
nail polish

Nail Polish Day
bounce

Bounce Day
one

One Day
get funky

Get Funky Day
ruby

Ruby Day
cuddle up

Cuddle Up Day