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

Other days

pampering

Pampering Day
bow tie

Bow Tie Day
ruby

Ruby Day
blanket fort

Blanket Fort Day
bonang

Bonang Day
latina equal pay

Latina Equal Pay Day
camera

Camera Day
china

China Day
emoji

Emoji Day
ride the wind

Ride The Wind Day