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

Other days

one

One Day
eat what you want

Eat What You Want Day
bonang

Bonang Day
boy friend

Boy Friend Day
lumpy rug

Lumpy Rug Day
pick me

Pick Me Day
ormille

Ormille Day
cuddle up

Cuddle Up Day
brow

Brow Day
buddy

Buddy Day