The best thing I can think of is in Pontiac- a scary place in itself. Try the Crofoot for twenty excellent Detroit bands performing incognito as they conjure up their alter egos and perform as other musicians.
Keep on the look-out for the gal in the Cher costume. The Entire reason I've been rocking 25+ inches [yeah, just measured] of hair for the past year- Excellent! [although cannot wait to chop it] Halloween is serious business, y'know.