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

Other days

boy friend

Boy Friend Day
fiancee

Fiancee Day
mean girls

Mean Girls Day
offer

Offer Day
kiss a brunette

Kiss A Brunette Day
self care

Self Care Day
book

Book Day
carpenters

Carpenters Day
donate your hair

Donate Your Hair Day
stud

Stud Day