Vivian and other members of her group are attending an event where they have to give short, uninterrupted speeches, one after the other. The moderator has a passive role during the course of the discussion, he or she has to simply introduce the presenters and manage the time frame of the event. At the end of the discussion, the moderator engages with the presenters and audience to ask questions and point to areas of agreement or disagreement.

Vivian is part of a _____.

A symposium is a discussion held in public and arranged so that groups of experts in a particular field of study can come together and present information, papers, discoveries, and new researches and also to provide recommendations as to what is and not to be done

A moderator for the symposium and the panel members usually seat in front of an audience to whom a prepared brief report is presented by the panel group members after which the key point may be summarized by the moderator and the audience can take part in asking questions which are answered by the panel members

Therefore;

Vivian is part of a panel discussion at a symposium