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

Other days

pampering

Pampering Day
bounce

Bounce Day
bow tie

Bow Tie Day
polyamory

Polyamory Day
first love

First Love Day
fiancee

Fiancee Day
camera

Camera Day
self care

Self Care Day
offer

Offer Day
brow

Brow Day