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

Other days

bow tie

Bow Tie Day
offer

Offer Day
healing

Healing Day
boy friend

Boy Friend Day
kiss a brunette

Kiss A Brunette Day
lisp

Lisp Day
ponytail

Ponytail Day
buddy

Buddy Day
kiss a ginger

Kiss A Ginger Day
eat what you want

Eat What You Want Day