Leadership / Business groups

More of a business and investments question but...I am in the Chicago area and am looking to get active in leadership/business groups and was wondering if any of you have any advice or belong to any of these types of groups. Essentially, I am recently single and am looking to use the free time to better myself and further my career and don't really know where to look. Thank you in advance and PM me if you need more details on my profession/background, etc. Thanks!