How do I find out if Chicago attractions have reservations available before I purchase? June 16, 2021 12:38 Chicago attractions may be sold out or require a wait for the next available entry; for details, view the Availability Calendar. Related articles Do CityPASS attractions require reservations? What is your refund policy? What should I do if I get an error message, "This number has been used the maximum number of times" while trying to make reservations at Museum of Science and Industry (MSI) in Chicago or Guggenheim Museum in New York? What are holiday hours for the CityPASS call center? Do you offer an app for my phone?