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

Other days

stud

Stud Day
nail polish

Nail Polish Day
book

Book Day
boba

Boba Day
nae nae

Nae Nae Day
cursing

Cursing Day
latina equal pay

Latina Equal Pay Day
tell a fairytale

Tell A Fairytale Day
girl friend

Girl Friend Day
ponytail

Ponytail Day