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

Other days

fiancee

Fiancee Day
aloxolt

Aloxolt Day
lash

Lash Day
latina equal pay

Latina Equal Pay Day
prosecco

Prosecco Day
martini

Martini Day
self appreciation

Self Appreciation Day
donate your hair

Donate Your Hair Day
bow tie

Bow Tie Day
law

Law Day