The witches are out at Gardner Village (1100 W. 7800 S.) thru October 31. My kids look forward to this every year - Gardner Village decorates with a fun display of wacky witches all around. There is also a Witch Fest calendar of events here.
Also, one fun thing to do when you go is the Witch Scavenger Hunt. Through the end of October, kids 12 and under can take their completed scavenger hunt form (print one here) to the Naborhood Bakery to receive a chocolate chip cookie for $0.35 (normally $0.90).