Alignment is the real deliverable
The wireframe is not the point. The point is a shared understanding of the problem you are solving and why it matters. If you leave a kickoff with a beautiful artifact but no alignment, you have created work, not progress.
Ask the questions everyone avoids
The most valuable questions in a stakeholder session are the uncomfortable ones. What happens if we do nothing? Who disagrees with this direction internally? What has been tried before and failed? These reveal the constraints that will shape every decision downstream.

Turn opinions into criteria
Stakeholders give you opinions. Your job is to convert them into decision criteria. "Make it pop" becomes "increase visual hierarchy on the primary action." Once opinions become criteria, disagreements become solvable instead of personal.
Close the loop
End every session by playing back what you heard. Not your interpretation — their words, structured. This single habit prevents ninety percent of the rework that happens when a project is three weeks in and someone says "that is not what I meant."