Oops, it doesn't look like 'what if cats and dogs had opposable thumbs day' is a national day..

Other days

Get Funky Day

Lash Day

Raise Awerness Of Zeus Day

Prescription Drug Take Back Day

Offer Day

Unicorn Day

Frozen Yogurt Day

Fiancee Day

Appreciate Yaself A Lil Extra Day

Lumpy Rug Day