Welcome to our forum.
You could try our Dating & Friendships subforum
... also try something like Googling "Polyamory Chicago" and see what turns up. If there are any local groups, you can get together with them and make some new friends.
Hope you enjoy your stay with us, glad you're aboard. Look around at our different boards and threads, and post any time you have a thought/concern/question.
Wishing you the very best.