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

Other days

gum

Gum Day
lash

Lash Day
fiancee

Fiancee Day
pick me

Pick Me Day
buddy

Buddy Day
bow tie

Bow Tie Day
self care

Self Care Day
china

China Day
tell a fairytale

Tell A Fairytale Day
bounce

Bounce Day