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

Other days

girl friend

Girl Friend Day
kiss a ginger

Kiss A Ginger Day
pick me

Pick Me Day
unicorn

Unicorn Day
martini

Martini Day
artists

Artists Day
cuddle up

Cuddle Up Day
healing

Healing Day
boy friend

Boy Friend Day
get funky

Get Funky Day