Hey Brad
The Events Calendar and the related plugins are all powered by self-hosted WordPress. The exceptions being that Event Aggregator processes on our servers and imports into client WordPress sites, and one more that might be a option for you.
Check out our latest event calendar tool that you can use on any content management system: Loxi.io. You can get started with a free trial today and see if it will meet your needs.
At this time, we do not have a demo of the back end. However, you can see for a demo of the front end of our products. Check it out at WP Shindig Demo Site https://wpshindig.com/events/.
Read more at: Do you have a demo, examples I can see, or trial licenses?
Is there anything else I can help you with?
Thanks
Courtney 🙂