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

Other days

lisp

Lisp Day
cat girl

Cat Girl Day
ruby

Ruby Day
stud

Stud Day
china

China Day
singles

Singles Day
kiss a brunette

Kiss A Brunette Day
carpenters

Carpenters Day
pick me

Pick Me Day
nail polish

Nail Polish Day