Ash Pryce is a magician and skeptic with two main shows this year on debunking frauds who claim mystical powers but who are doing it the same way he does: cheating, aka 'magic'.
This one is on communicating with dead people, and covers the history of spiritualism from its invention in 1848. As well as the obvious cold reading (throwing out guesses until something sticks – people will remember the hits and forget the misses), it also includes the Ouija Board (originally presented as a game rather than any thing serious), ectoplasm (a wonderful demonstration) and all the rest of the fake medium repertoire. Most of it is explained, but a highlight isn't: trepanning done via the nose. Don't try it at home, but do see it being done.