Seeking Free Tools for Online Pet Community Events and Training

Hi All! We are pet-centric discount club and are building a community for our members. We'll be hosting online events for dog training and also for "group therapy" related to nurturing the human-animal bond. We have Zoom as a starting point. Looking for recommendations on super user-friendly, inexpensive (free!) online event solutions that work with Zoom or as a standalone to consider for hosting engaging events. Thanks!