Oops, it doesn't look like 'adopt a dark tortie day' is a national day..

Other days

bow tie

Bow Tie Day
self appreciation

Self Appreciation Day
camera

Camera Day
stud

Stud Day
kale

Kale Day
cuddle up

Cuddle Up Day
ruby

Ruby Day
pampering

Pampering Day
gallery

Gallery Day
reading

Reading Day