Manage Category

1: Add New Category

Go to Event >> Category >> Insert Name of category
Edit Category

2: Display Category at frontend

Go to Apperance >> Menu >> Edit a Menu >> Choose a category in Event Categories tab and add to menu
Category display at frontend

3: Customize Template of Category at frontend

Copy file: Plugins/ova-events/templates/archive-event.php file
Your-theme/ovaev-templates/ folder. You have to create "ovaev-templates" folder in your theme.