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

Other days

gum

Gum Day
lisp

Lisp Day
ruby

Ruby Day
coffee

Coffee Day
me

Me Day
bow tie

Bow Tie Day
comfy

Comfy Day
eat what you want

Eat What You Want Day
hot chocolate

Hot Chocolate Day
special education

Special Education Day