* Organizer: A person or organization plans and hosts the symposium, inviting speakers and attendees.
* Speakers: Experts in the field deliver presentations or talks on different aspects of the chosen topic.
* Moderator: A person leads the discussion and ensures the flow of information. They may also pose questions to the speakers and facilitate Q&A sessions with the audience.
* Audience: Participants attend to learn, network, and engage in discussions related to the symposium's theme.
So, while a single individual might organize or moderate a symposium, it's the collective efforts of multiple speakers that deliver the actual content and knowledge shared during the event.