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

Other days

martini

Martini Day
blanket fort

Blanket Fort Day
fiancee

Fiancee Day
self care

Self Care Day
brow

Brow Day
cat girl

Cat Girl Day
camera

Camera Day
prosecco

Prosecco Day
ride the wind

Ride The Wind Day
eat what you want

Eat What You Want Day