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

Competition
Ask a series of questions and declare a winner at the end for the person who scores the most points.

Panel questions
Quickly crowdsource the best audience questions after a panel discussion.

Spark engaging dialogue
Build lasting relationships with your team by asking (and sharing) what they have learned about themselves. Bonus: ask what positive changes can be made as a result of these learnings.