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

Other days

offer

Offer Day
singles

Singles Day
bow tie

Bow Tie Day
boba

Boba Day
pampering

Pampering Day
bubble bath

Bubble Bath Day
cuddle up

Cuddle Up Day
camera

Camera Day
kiss a brunette

Kiss A Brunette Day
hannah

Hannah Day