Assign a parent term to create a hierarchy. The term Jazz, for example, would be the parent of Bebop and Big Band. By default template file archive.php is being used. This file is located in your theme folder. My plugin does not support this file, so the event category page will not be displayed properly. Template file single.php (and in some cases single-event.php) is being used to display a single event. This file is located in your theme folder.
The text contains 7 words. This is far below the recommended minimum of 150 words. Add more content that is relevant for the topic.