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

Other days

gum

Gum Day
comfy

Comfy Day
artists

Artists Day
buddy

Buddy Day
believe

Believe Day
hiv awareness

Hiv Awareness Day
eat what you want

Eat What You Want Day
lisp

Lisp Day
blanket fort

Blanket Fort Day
kale

Kale Day