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

Other days

brow

Brow Day
cat girl

Cat Girl Day
lumpy rug

Lumpy Rug Day
fiancee

Fiancee Day
kiss a brunette

Kiss A Brunette Day
buddy

Buddy Day
first love

First Love Day
bubble bath

Bubble Bath Day
offer

Offer Day
donate your hair

Donate Your Hair Day