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

Other days

kale

Kale Day
hoodie

Hoodie Day
believe

Believe Day
bubble bath

Bubble Bath Day
comfy

Comfy Day
buddy

Buddy Day
azonto is acceptable

Azonto Is Acceptable Day
bounce

Bounce Day
my little pony

My Little Pony Day
law

Law Day