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

Other days

nae nae

Nae Nae Day
gum

Gum Day
pick me

Pick Me Day
hoodie

Hoodie Day
get funky

Get Funky Day
stress awareness

Stress Awareness Day
slime

Slime Day
brow

Brow Day
kiss a ginger

Kiss A Ginger Day
hiv awareness

Hiv Awareness Day