What I have discovered works well is:
1) I show up early to the meeting, indicating I'm ready, and value their time.
2) Before the meeting I send the necessary materials or the latest versions of the designs. This allows them to review the information prior to the meeting and collect their thoughts so our time together is used efficiently and effectively.
3) At the end of the meeting I strive to set up a schedule of appointments. This provides structure to the design process and keeps the project moving forward.
4) After our meeting I send them recap notes to make sure we are aligned in our thoughts, so my revisions are on target.