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

Other days

bonang

Bonang Day
tulip

Tulip Day
ponytail

Ponytail Day
carpenters

Carpenters Day
embarrass your best friend

Embarrass Your Best Friend Day
boy friend

Boy Friend Day
hannah

Hannah Day
buddy

Buddy Day
stud

Stud Day
pick me

Pick Me Day