Ensure that everyone knows each other. Make introductions and use name tags if necessary. Get people involved immediately by asking them to do something, such as writing down ideas or passing around a sign-up sheet. Follow the agenda. Introduce each topic with a brief background statement and let the group know what type of action needs to be taken and how much time you will spend on each item.
Audience participation keeps people interested.
Keep the meeting moving. Focus on the matter at hand and keep the discussion on track. Get everyone to participate by asking questions of people who aren't contributing so that they will be brought into the discussion. Make sure newcomers are included and understand what's going on. Many new activists will suggest having them frequently.