Post-meeting feedback

Make sure every concern is addressed by asking for final thoughts before wrapping up a meeting.
Use Poll Everywhere to ensure everyone is able to voice their opinion.
People respond online or by texting on their phones and the responses appear live for all to see.
Enable anonymity for any poll type to encourage frank or critical feedback. Poll Everywhere makes it easy for shy or otherwise reluctant participants to contribute alongside their peers.
More types of activities

Audience demographics
Put subsequent question responses in context by gathering some quick demographic data from the audience.

Multiple choice
Ask a question and people choose a response from a set list of answers.

Panel discussion gamification
Gamify panel discussions, Survivor-style. Ask the audience to periodically vote panelists off the “island” until only one panelist remains.