Events can be grouped by category. Clicking "Manage Categories" in the left column brings you to a list of all the categories currently active on your website.
To edit an existing category, click the pencil icon in the far right column.
To delete an existing category, click the garbage can icon in the far right.
Adding a category is simple: click "Create Category" in the left column, then give your category a name. The name field is required. The SEO URL slug field is optional, as this will be auto-generated once you click the orange "Create" button in the upper right corner.