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

Other days

camera

Camera Day
hiv awareness

Hiv Awareness Day
eat what you want

Eat What You Want Day
hoodie

Hoodie Day
lisp

Lisp Day
self care

Self Care Day
gallery

Gallery Day
bounce

Bounce Day
cursing

Cursing Day
unicorn

Unicorn Day