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
Multiple choice
Ask a question and people choose a response from a set list of answers.
Teams by color
Split your participants into teams by color. Future questions can then segment responses by team.
Conference takeaway
What overarching impression did the conference make on participants? Ask the audience to provide feedback.