Hey joe,
MY BAD! I read that wrong. Custom Attributes are included out of the box with the PRO plugin. They are essentially custom field types that are associated with each event and displayed on the event page.
As far as front end filters go, it would take customization to use the Custom Attributes as a filter. Event our upcoming Filter Bar plugin won’t allow you to do that without customization. But once it’s out, it could make those customizations simpler.
I apologize for my earlier response. I hope I’ve cleared up the confusion here. Please let me know if there’s anything else I can help you with.
— Julie