From the Marengo Park District:
Join the Marengo Park District for Day in the Park

It sure sounds like Indian Oaks Park is going to be the place to be on Saturday, July 12!
From 4 to 11 p.m. that day, Indian Oaks Park will be filled with all sorts of activities, such as a splash zone, inflatables, contests, food, drink, live music, and a fireworks display.
Admission is free, but donations are appreciated. To learn more about the day and particular events, click here.
The park is located at 825 Indian Oaks Trail, on the southwest side of town.