Start when you said you would. Don't punish the punctual.
Establish the meeting's purpose. Communicate it to all. Let the purpose statement be your roadmap.
Tell attendees what is expected of them and why. They are responsible, too.
Time each segment. Appoint a timekeeper. Work within the timing guidelines.
Open with a joke; they often fail. (And what a hole to dig out of!)
Invite even one unnecessary person. Everyone should have a role and a responsibility.
Hold a meeting without every attendee understanding his or her specific role and the meeting's purpose.
End a meeting late. You blow it all if you run over the time scheduled for the meeting to end. Professionals finish on time.