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

Other days

get funky

Get Funky Day
hoodie

Hoodie Day
eat what you want

Eat What You Want Day
offer

Offer Day
lumpy rug

Lumpy Rug Day
ride the wind

Ride The Wind Day
one

One Day
pumpkin

Pumpkin Day
lisp

Lisp Day
comfy

Comfy Day