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

Other days

self appreciation

Self Appreciation Day
lumpy rug

Lumpy Rug Day
china

China Day
carpenters

Carpenters Day
kale

Kale Day
lash

Lash Day
blanket fort

Blanket Fort Day
artists

Artists Day
lisp

Lisp Day
tulip

Tulip Day