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

Other days

coffee

Coffee Day
get funky

Get Funky Day
one

One Day
camera

Camera Day
cuddle up

Cuddle Up Day
ask out your crush

Ask Out Your Crush Day
blanket fort

Blanket Fort Day
promposal

Promposal Day
hoodie

Hoodie Day
kale

Kale Day