You can use Google Maps to find the venue if you just put in the name. As you are driving down 31st St/Oak Brook Rd, look for a sign that says Oak Brook Bath and Tennis and follow the winding road. It should lead you straight to the venue.
There is a free parking lot located at the venue. It should be enough space for anyone who is driving!
If you are flying into Chicago from out of town you can fly into O'Hare International Airport or Chicago Midway Airport. The venue is about the same distance from each airport. The venue is most easily accessible by car after that. You could get an Uber or a Taxi to take you to the venue or your hotel after you land. Some hotels also have shuttles that take you to and from the airport. Let us know if you have questions about transportation as you are thinking about coming for the wedding!