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

Other days

get funky

Get Funky Day
donate your hair

Donate Your Hair Day
cursing

Cursing Day
law

Law Day
polyamory

Polyamory Day
tulip

Tulip Day
blanket fort

Blanket Fort Day
cuddle up

Cuddle Up Day
pumpkin

Pumpkin Day
hoodie

Hoodie Day