Events + Custom Post Type Activation, Periodic WP Theme

Hello All,

I am encountering a problem using the Events+ plugin. The Events Categories are not populating into my normal WP category lists which means that I can't assign them to menus, featured post sliders, or category blocks in my current theme. Does anyone have advice for how to fix this? I only plan to use events posts for this entire subsite, but for now I am just using normal posts. If it is simply a matter of activating custom post types, I could really use help identifying how to do that with this theme.

Theme: Periodic

Thanks so much for any help or advice!