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

Other days

camera

Camera Day
bow tie

Bow Tie Day
youth

Youth Day
kiss a ginger

Kiss A Ginger Day
unicorn

Unicorn Day
get funky

Get Funky Day
one

One Day
hoodie

Hoodie Day
self care

Self Care Day
singles

Singles Day