Couldn't make it work (PHP issue with host)so I uninstalled. Somewhere in the notes I saw some pious stuff about the database being mine, so it was left in place. It has now poisoned my site; I'm not sure what to delete and the ones in wp-content that do seem to relate can't be deleted by any means available to me. A different Event list plug-in is picking up your event and category slugs because it uses the same shortcodes.
Sick to my stomach; have to roll back to a backup that's two busy days old. Uninstall means uninstall. If there was something I wanted to keep I'd have found a way to save it.