Oops, it doesn't look like 'have a coca cola day' is a national day..

Other days

lisp

Lisp Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
ride the wind

Ride The Wind Day
lost sock memorial

Lost Sock Memorial Day
pampering

Pampering Day
gum

Gum Day
singles

Singles Day
lash

Lash Day
tell a fairytale

Tell A Fairytale Day
stress awareness

Stress Awareness Day