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

Other days

polyamory

Polyamory Day
buddy

Buddy Day
get funky

Get Funky Day
bonang

Bonang Day
azonto is acceptable

Azonto Is Acceptable Day
bow tie

Bow Tie Day
frozen yogurt

Frozen Yogurt Day
comfy

Comfy Day
lash

Lash Day
china

China Day