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

Other days

artists

Artists Day
lisp

Lisp Day
bonang

Bonang Day
tell a fairytale

Tell A Fairytale Day
brow

Brow Day
kiss a ginger

Kiss A Ginger Day
china

China Day
cuddle up

Cuddle Up Day
believe

Believe Day
fiancee

Fiancee Day