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

Other days

pumpkin

Pumpkin Day
fiancee

Fiancee Day
lumpy rug

Lumpy Rug Day
promposal

Promposal Day
hannah

Hannah Day
self care

Self Care Day
kiss a brunette

Kiss A Brunette Day
kiss a ginger

Kiss A Ginger Day
lisp

Lisp Day
ponytail

Ponytail Day