If nothing was unclear or difficult, say so. Skip questions about steps you did not experience; use not applicable where appropriate.

Which session description was unclear?
What scheduling conflict did you notice?
What information would help choose sessions?

Author notes / illustrative keys where applicable:
1. Use this answer to locate the part of the experience that needs explanation. The example issue to investigate is: attendees cannot distinguish introductory and advanced sessions.
2. Schedule conflicts expose competing sessions or inadequate transition time for a particular attendee plan. Clarify alternatives and actual timings; preferences alone cannot determine which agenda serves the entire event audience.
3. Turn the requested improvement into a testable next step. One illustrative action is: label session level and intended audience.