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

Other days

tulip

Tulip Day
kiss a ginger

Kiss A Ginger Day
boba

Boba Day
law

Law Day
slime

Slime Day
gum

Gum Day
comfy

Comfy Day
nae nae

Nae Nae Day
pick me

Pick Me Day
martini

Martini Day