R.B.
Pin the nose/hat/wart on the witch/ogre. Broomstick limbo. Toss the beanbag into the mouth of a troll/ghost/monster. Make flubber/slime (dozens of recipes online). Creepy sensory boxes with jello and slime. Whoever dares to put their hand in gets a candy. Buy a cardboard skeleton and trace around it on a big piece of butcher paper on the wall then take apart the skeleton and hide the pieces and have a skeleton hunt where they bring the parts back and assemble the skeleton. Award different values for the assorted body parts and then give prizes accordingly.