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

What changed about your arrival plan?
Which update was difficult to find?
What information would help?

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: updates do not explain which activities moved indoors.
2. A hard-to-find update reveals which communication route failed to reach the attendee's immediate planning task. Make the current official notice discoverable, without implying that published weather plans guarantee safe conditions.
3. Turn the requested improvement into a testable next step. One illustrative action is: list changed locations and affected activities.