Hi. Thanks for your business and this question.
Our Filter Bar add-on, which you linked to, is required for you to enable your site visitors to filter events themselves.
However, you can filter display of events by Event Category, Organizer, Venue, etc. via our the PRO widgets and shortcodes.
Please use this information to determine if you think you’ll need to add Filter Bar to your site.
Last but not least, we have Bundles and a pretty great Refund Policy so you can buy one or many of our add-ons and thoroughly test them.
I hope this info helps. Let me know if you have any follow-up questions.