Hi David, welcome to the community! It’s great to have you here and learn that you’re interested in running a Restart Party 
I’m James, one of the staff team here.
You’re right that there aren’t many Restart Parties in the USA at the moment, although there have been some in the past (you can search for groups in the US on this site here). In the USA, it’s more common to find community groups running Repair Cafés or Fixit Clinics, which are both really similar to Restart Parties; the core concept is the same: bringing together volunteer repairers and local people with broken stuff to share skills, reduce waste and build relationships. Many Repair Cafés are part of the the Repair Café International network and you can search for one near you here. The Fixit Clinic network only operates in the US and online. You can learn more about them here (and they list events in this Google Form).
In any case, you are more than welcome to run your own Restart Party in Iowa (or Repair Café or Fixit Clinic)!
I’m not aware of any legal issues that would prevent you from running a Restart Party, so we can certainly help you get up and running 
It sounds like you’ve already found the main Restart Party Kit. You can find additional guidance here on the forum in the topics listed here. You’re also welcome to make use of the organiser tools here on the site. Learn more about those here.
Do let us know if you need a hand or have any questions 