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

Other days

cuddle up

Cuddle Up Day
polyamory

Polyamory Day
bow tie

Bow Tie Day
believe

Believe Day
slime

Slime Day
lisp

Lisp Day
first love

First Love Day
nail polish

Nail Polish Day
raise awerness of zeus

Raise Awerness Of Zeus Day
gum

Gum Day