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

Other days

china

China Day
cuddle up

Cuddle Up Day
coffee

Coffee Day
hannah

Hannah Day
tell a fairytale

Tell A Fairytale Day
believe

Believe Day
offer

Offer Day
hoodie

Hoodie Day
eat what you want

Eat What You Want Day
unicorn

Unicorn Day