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

Other days

promposal

Promposal Day
brow

Brow Day
blanket fort

Blanket Fort Day
lisp

Lisp Day
slime

Slime Day
girl friend

Girl Friend Day
ride the wind

Ride The Wind Day
ruby

Ruby Day
believe

Believe Day
eat what you want

Eat What You Want Day