Continued Education credit
If your company offers Continuing Education (CE) credits for attending training sessions, ensure that everyone receives their due by taking attendance.
More types of activities
Panel discussion gamification
Gamify panel discussions, Survivor-style. Ask the audience to periodically vote panelists off the “island” until only one panelist remains.
Self-paced survey
Ask questions before or after an event that people can answer at their own pace.
Competition
Ask a series of questions and declare a winner at the end for the person who scores the most points.