Oops, it doesn't look like 'return and exchange day' is a national day..

Other days

boy friend

Boy Friend Day
hot chocolate

Hot Chocolate Day
self care

Self Care Day
ormille

Ormille Day
stud

Stud Day
cuddle up

Cuddle Up Day
boba

Boba Day
hoodie

Hoodie Day
kale

Kale Day
bounce

Bounce Day