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

Other days

kiss a brunette

Kiss A Brunette Day
nail polish

Nail Polish Day
book

Book Day
boba

Boba Day
buddy

Buddy Day
kiss a ginger

Kiss A Ginger Day
law

Law Day
stud

Stud Day
lisp

Lisp Day
gallery

Gallery Day