Hello @stephenperkins,
We have set up events archive page by default on plugin activation.
If you want to override the events archive then you can use the register_post_type_event_listing hook to modify the rewrite slug parameter. It is hooked in the class-simple-event-planner-post-type-event-listing.php file at line # 145 placed in simple-event-planner/includes directory.
Thanks for reaching us out. Let us know if you need any further assistance from us.
That may work if I still had the plugin installed. But I uninstalled it to reverse the URL override, and the effect is still taking place. How do I reverse the URL override?
Sorry for the inconvenience.
If you have uninstalled the plugin then how can it be affected by our plugin? it seems that you have another event plugin that is overriding the URL. If yes then again deactivate that plugin and then see this issue.