Chicago Park District is not free. We're having our wedding at the South Shore Cultural Center in September 2011, but it's half, or more, the cost of some other venues in the city. Check the park's Promontory Point as there is an area on the north side that can take chairs and canopy for a ceremony. The dining hall can hold 100 or 150, I forgot, but all the doors/windows open, so you feel like you're outside all the time. It has one of the best views of the city. Otherwise, if you're in the burbs, check out Seven Bridges in Woodridge. The owner is a family friend and she's been doing banquets for twenty years, sharp. Also, it's on a golf course, so there's plenty of outdoor space. If you need to go the other way, there's Belvedere Banquets in Elmhurst or Elmwood Park--forgot, but hear it's gorgeous and has outdoor spots. A co-worker, who plans weddings on the side, is getting married there this July. Oh, another family friend has Royalty West in Willow Springs. Great food, nice setting, and they have a gazebo for ceremonies and a nice pond area for pictures. Hope this helps! Good luck!