Make sure you have read all of the materials provided in advance, including the agenda. Find out who will be attending. Discover the purpose of the meeting and focus your preparations on that. Prepare any comments in advance so that you're not rambling and repeating yourself. This universally recognized guide to procedure will only come into play at the most formal of meetings.
Nobody takes a late-comer seriously.
Lateness is an affront to those who troubled to arrive on time. If you must cross your legs, do so at the ankles, otherwise, you look inattentive and altogether too casual. Make sure your shoes are polished and in good repair. Scuffed shoes imply a person ho disregards details. Meetings are a place for team players.