The question of “Where can I find more events like this?” is a common one, and honestly for people who have been competing for years we take our knowledge for granted.
There are a lot of sites out there to help find events. Lets focus on Iowa and sorta close to Iowa events first. Below is a series of links to websites of clubs that host events. Main focus is AutoX but there are some HPDE/TE (track days), Time Attack and RallyX links as well.
I’ve also added a few videos to give you an idea of what type of racing events that are available.
http://iowaregionscca.org/events.html
http://www.sccagrr.com/schedule/schedule.html
http://www.3ballsracing.com/2017-schedule-updated
https://www.tracknightinamerica.com/
https://scca-chicago.com/track-days/
https://scca-chicago.com/autocross/
https://mnautox.motorsportreg.com
Video Examples:
AutoX:
Track Day:
RallyX:
There are numerous other forms of amateur racing out there, the new Endurance races are awesome. They need a post all their own to be honest.