We need better public transportation for the people who want to visit but can’t afford parking.
The park-and-ride option for the streetcar is a VERY good option. (KC Public Trans is fare-free through this year, hopefully it’ll be renewed.) There are several places along or near the line where you can park for free and streetcar into downtown. 3rd street’s probably the easiest, but I work near Union Station so I usually park around there. That’s what I did for Comicon back in March.