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

Other days

prosecco

Prosecco Day
chocolate milkshake

Chocolate Milkshake Day
offer

Offer Day
gum

Gum Day
self care

Self Care Day
stud

Stud Day
nae nae

Nae Nae Day
azonto is acceptable

Azonto Is Acceptable Day
camera

Camera Day
ormille

Ormille Day