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

Other days

gum

Gum Day
my little pony

My Little Pony Day
camera

Camera Day
kiss a brunette

Kiss A Brunette Day
buddy

Buddy Day
slime

Slime Day
nail polish

Nail Polish Day
eat what you want

Eat What You Want Day
lash

Lash Day
one

One Day