@Eric M., I'm directly on target actually. You are asking people here if certain areas of the city (code for where brown and black people tend to live) are dangerous for your child. You would not have asked this question if your child was going to Navy Pier (knife stabbing there last weekend), or the Gold Coast (constant robberies), or Lincoln Park (shootings). Your underlying question wasn't about the safety of your child, but about what type of people live in the area of the park. Your child is in no more danger going to Hamilton Park for an event than he is going to any other park for an event, including Millennium and Grant Parks, or being in a public place (work, school, mall).
Tell your child to simply be aware of their surroundings and act like they belong there. People tend to prey on fear.
Unfortunately, your self-admitted "cognitive bias (white, north side)" has cause you to ask a question that screams racism to those who know what it looks like.