The Category Module is included by default on all Event and Business pages, and it's not available for dynamic pages - so it won't appear as an option among the modules you can add.
If the category has subcategories, then the event/business will also require a subcategory.
- You can assign an event/business to multiple categories with the ADD CATEGORY button
- the module can be hidden (from the PowerDots), but it cannot be deleted
- the module can be Scheduled (from the PowerDots)