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

Other days

buddy

Buddy Day
bonang

Bonang Day
china

China Day
bow tie

Bow Tie Day
cuddle up

Cuddle Up Day
gallery

Gallery Day
law

Law Day
eat what you want

Eat What You Want Day
lisp

Lisp Day
offer

Offer Day