How do you keep meeting on schedule

1. Set the Agenda. Meetings need a reason. ...
2. Know Who is Where. Monitor who is in attendance. ...
3. Timing is Everything. Start the meeting on time. ...
4. Know the Agenda. Have each agenda item assigned to a meeting member who is able to speak to the issue
5. Review the Previous Meeting's Minutes. This is a serious risk management issue

Have a variety in questions closed/open ended. Park questions that require additional inputs to support answer, invite specific audience, send out the agenda prior to meeting.

You have already received good suggestions. Few from my end-
1. Try to limit audience. Choose a representative from every stream to join the meeting at initial stage. When you have some good action points to discuss, then you can invite entire audience.
Calling the entire group at once will lead you nowhere.
2. Prepare agenda. Ensure that your audience come prepared. Start/stop meeting on time.
3. Timeboxing for every speaker may also help you.

Meeting Agenda + Ground rules.

Vincent, I side with my colleagues to set a ground rules, time and sending advanced agenda, here are more few points I found quite effective
1. Language is so important evaluate body language, tone, words chosen, volume and intensity, and inflection.
2. Project a good sense of humor.
3. Focus at macro and micro levels of detail in real time.
4. Maintain poise in front of a group regardless of high management level if present at the meeting.
5. Take control of a group without being obtrusive, abrasive or autocratic.
6. Stay on course while allowing freedom in dialogue.
7. Maintain Group dynamics, allow participation but filter audience
8. Resist imposing personal views and opinions during the process.
9. Improvise with confidence when under pressure and defuse conflict as temper might flare and high verbal jousting may occurs which is different from constructive discussion
10. Have refreshment coffee would be the choice of most of us.