Oops, it doesn't look like 'appreciate keri winters day' is a national day..

Other days

hoodie

Hoodie Day
nail polish

Nail Polish Day
nae nae

Nae Nae Day
reading

Reading Day
my little pony

My Little Pony Day
one

One Day
buddy

Buddy Day
offer

Offer Day
stud

Stud Day
camera

Camera Day