Yes! There are many more hotel options downtown, which is great if you'd also like to visit some of Chicago's attractions, such as the Art Institute, Cloud Gate (or The Bean), Architectural tours, the Magnificent Mile, etc. However, the Chicago Marathon is ALSO on 10/10/21. It should wrap up by 3, but it may complicate travel due to road blockages and general traffic.
No. We're working on a map that will show where the course is relative to where St. John Berchman's and Park and Field, but it's a few miles south and west of us.
There is street parking available for both the ceremony and reception.