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

Other days

brow

Brow Day
china

China Day
camera

Camera Day
ruby

Ruby Day
kiss a ginger

Kiss A Ginger Day
tulip

Tulip Day
gum

Gum Day
polyamory

Polyamory Day
pampering

Pampering Day
offer

Offer Day