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

Other days

coffee

Coffee Day
pick me

Pick Me Day
hoodie

Hoodie Day
bow tie

Bow Tie Day
offer

Offer Day
tell a fairytale

Tell A Fairytale Day
china

China Day
nail polish

Nail Polish Day
nae nae

Nae Nae Day
first love

First Love Day