We'll be staying here, but there are a TON of great hotels in and around this area. Of note if you're looking to make your transportation post-wedding easy there's a hotel very near the venue called Hotel Lincoln.
There are currently no plans for structured transportation. Chicago is an extremely easy city to use public transportation and there's a very strong Uber presence. For getting from the venue to/from the Westin on Michigan Avenue it's...
1.7 miles walking
9 minutes by Uber
~20 minutes by bus (the 151 bus)
Meanwhile Hotel Lincoln is an 8 minute walk from the venue in an extremely safe area of town.