Oops, it doesn't look like 'adopt a black dog day' is a national day..

Other days

bow tie

Bow Tie Day
prosecco

Prosecco Day
get funky

Get Funky Day
kiss a ginger

Kiss A Ginger Day
kiss a brunette

Kiss A Brunette Day
me

Me Day
brow

Brow Day
ruby

Ruby Day
unicorn

Unicorn Day
tulip

Tulip Day