Question

In which type of group discussion does the moderator perform a passive role in the discussion?

Roundtable
Townhall meeting
Symposium
Panel discussion

Answer 1

I believe the answer is Panel discussion because if you take out the moderator out of a panel discussion it becomes a roundtable

Answer 2

Answer: Symposium

A symposium is a public meeting in which speakers give presentations about a particular topic. These are usually academic. Many people who attend symposiums will be both atendees and presenters at different points in time. Some symposiums also include panel discussions. Symposiums can be one-time conferences, as well as regular meetings.