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

Other days

cat girl

Cat Girl Day
artists

Artists Day
hannah

Hannah Day
offer

Offer Day
believe

Believe Day
raise awerness of zeus

Raise Awerness Of Zeus Day
cuddle up

Cuddle Up Day
bow tie

Bow Tie Day
get funky

Get Funky Day
tulip

Tulip Day