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

Other days

promposal

Promposal Day
blanket fort

Blanket Fort Day
lumpy rug

Lumpy Rug Day
youth

Youth Day
reading

Reading Day
bounce

Bounce Day
pampering

Pampering Day
one

One Day
cuddle up

Cuddle Up Day
boyfriend

Boyfriend Day