http://www.swancc.org/hcw/hcwcollection.html
For people who leave around GHE in Oak Park, this will be a very helpful website for you. I often have customers looking for events and collection sites for their household hazardous waste. Here's your answer:
Visit the website of the Solid Waste Agency of Northern Cook County at http://www.swancc.org. Check out their resources, especially the household waste section. You can even sign up for their email list to be reminded of upcoming events!