Children 10 and younger are invited to come Trick-or-Treating at Millennium Park. Accompanied by an adult, come walk down the trail visiting local businesses collecting candy and other goodies. This is a FREE event for H-F residents, but pre-registration is required. Registration slots are staggered 15 minutes throughout the event. Non-residents can register for a fee of $2. This is a FREE event for H-F residents, Non-residents can register for a fee of $2.