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
Sprint retrospective
Gather feedback on the last sprint cycle to improve efficiency and productivity during the next sprint.
Audience demographics
Put subsequent question responses in context by gathering some quick demographic data from the audience.
Panel questions
Quickly crowdsource the best audience questions after a panel discussion.