Oops, it doesn't look like 'Pigs In Blanket day' is a national day..

Other days

boy friend

Boy Friend Day
lisp

Lisp Day
nail polish

Nail Polish Day
bow tie

Bow Tie Day
blanket fort

Blanket Fort Day
law

Law Day
gallery

Gallery Day
stud

Stud Day
promposal

Promposal Day
pumpkin

Pumpkin Day