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

Other days

pumpkin

Pumpkin Day
brow

Brow Day
boba

Boba Day
prosecco

Prosecco Day
hannah

Hannah Day
eat what you want

Eat What You Want Day
girl friend

Girl Friend Day
cuddle up

Cuddle Up Day
nail polish

Nail Polish Day
cursing

Cursing Day