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

Other days

singles

Singles Day
blanket fort

Blanket Fort Day
ruby

Ruby Day
nail polish

Nail Polish Day
lisp

Lisp Day
eat what you want

Eat What You Want Day
coffee

Coffee Day
camera

Camera Day
kiss a ginger

Kiss A Ginger Day
bow tie

Bow Tie Day