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

Other days

law

Law Day
healing

Healing Day
first love

First Love Day
self appreciation

Self Appreciation Day
promposal

Promposal Day
bubble bath

Bubble Bath Day
get funky

Get Funky Day
slime

Slime Day
boy friend

Boy Friend Day
boba

Boba Day