Besides activities at the Crown Center where the conference hotels are located, there are many interesting places to visit in KC such as the following:
National World War I Museum and Memorial
The Nelson-Atkins Museum of Art
National Museum of Toys and Miniatures
Truman Presidential Library & Museum
The newly introduced StreetCar service (you ride free!) allows you to hop on and hop off to visit several places from the conference venue.
For a review of many of these places, see the review at https://backroadplanet.com/kansas-city-museums/
All photos ©Visit KC