Here are some very short, drabble length, Doctor Who Halloween stories. Just for fun.
Trick or Treat Smell My Feet - Halloween has some strange customs.
Knock Knock - Somebody's knocking. Don't answer the door.
He's Not Dead - Things aren't what they seem.
Charles - You just have to believe.
Movie Monsters - He knows all the famous people.
Going to the Movies - Some things are just meant to be.