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

Other days

ride the wind

Ride The Wind Day
gum

Gum Day
lisp

Lisp Day
unicorn

Unicorn Day
buddy

Buddy Day
lumpy rug

Lumpy Rug Day
azonto is acceptable

Azonto Is Acceptable Day
donate your hair

Donate Your Hair Day
stud

Stud Day
singles

Singles Day