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

Other days

gum

Gum Day
eat what you want

Eat What You Want Day
boyfriend

Boyfriend Day
buddy

Buddy Day
cuddle up

Cuddle Up Day
ride the wind

Ride The Wind Day
bounce

Bounce Day
nail polish

Nail Polish Day
promposal

Promposal Day
lumpy rug

Lumpy Rug Day