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!