Oops, it doesn't look like 'open throughout the day' is a national day..

Other days

bonang

Bonang Day
lumpy rug

Lumpy Rug Day
ruby

Ruby Day
law

Law Day
lash

Lash Day
gallery

Gallery Day
bounce

Bounce Day
my little pony

My Little Pony Day
lisp

Lisp Day
ask out your crush

Ask Out Your Crush Day