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

Other days

tell a fairytale

Tell A Fairytale Day
law

Law Day
camera

Camera Day
get funky

Get Funky Day
buddy

Buddy Day
slime

Slime Day
blanket fort

Blanket Fort Day
ormille

Ormille Day
ride the wind

Ride The Wind Day
carpenters

Carpenters Day