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

Other days

comfy

Comfy Day
donate your hair

Donate Your Hair Day
get funky

Get Funky Day
bounce

Bounce Day
reading

Reading Day
cuddle up

Cuddle Up Day
my little pony

My Little Pony Day
boy friend

Boy Friend Day
camera

Camera Day
cursing

Cursing Day