panel discussion

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A discussion of a subject of public interest by a group of persons forming a panel, often before an audience.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A conversation about a specific topic conducted by a group of experts, usually either in the presence of an audience or in a broadcast (or both).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun discussion of a subject of public interest by a group of persons forming a panel usually before an audience