Oops, it doesn't look like 'get dress coded day' is a national day..

Other days

gum

Gum Day
cat girl

Cat Girl Day
lash

Lash Day
get funky

Get Funky Day
pick me

Pick Me Day
cuddle up

Cuddle Up Day
bubble bath

Bubble Bath Day
ruby

Ruby Day
special education

Special Education Day
cursing

Cursing Day