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

Other days

gum

Gum Day
brow

Brow Day
tell a fairytale

Tell A Fairytale Day
cuddle up

Cuddle Up Day
buddy

Buddy Day
emoji

Emoji Day
bow tie

Bow Tie Day
self care

Self Care Day
stress awareness

Stress Awareness Day
donate your hair

Donate Your Hair Day