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

Other days

unicorn

Unicorn Day
pick me

Pick Me Day
pumpkin

Pumpkin Day
get funky

Get Funky Day
blanket fort

Blanket Fort Day
lisp

Lisp Day
camera

Camera Day
brow

Brow Day
latina equal pay

Latina Equal Pay Day
ruby

Ruby Day