Topics for next class
Student questions often go unanswered during a class discussion. Collect them before they slip way so you can discuss them during the next class.
More types of activities
Audience demographics
Put subsequent question responses in context by gathering some quick demographic data from the audience.
Panel discussion gamification
Gamify panel discussions, Survivor-style. Ask the audience to periodically vote panelists off the “island” until only one panelist remains.