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

Other days

brow

Brow Day
blanket fort

Blanket Fort Day
gum

Gum Day
girl friend

Girl Friend Day
hoodie

Hoodie Day
bow tie

Bow Tie Day
get funky

Get Funky Day
cuddle up

Cuddle Up Day
carpenters

Carpenters Day
coffee

Coffee Day