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

Other days

pick me

Pick Me Day
kiss a ginger

Kiss A Ginger Day
brow

Brow Day
tulip

Tulip Day
cursing

Cursing Day
singles

Singles Day
gum

Gum Day
unicorn

Unicorn Day
kiss a brunette

Kiss A Brunette Day
cuddle up

Cuddle Up Day