If its a large group, zoom in and slowly pan across faces every 2 minutes or so. Two Cams and Live Mixing or Good Editing Live mixing is usually accomplished by 2 camera operators and a director who communicates through some headset arrangement and mixes between the cameras as the event goes live. Each cam is monitored for the director, and occasionally there is a technical director who knows the performance and cues the director to specific actions. Mixers are covered in Equipment 101 section. See if you can get a large room if you don't normally have one.
Chairs set arena style.
For extra flair, require groups to enact scenarios for each other as leads off. Keep audience camera nearly eye level to center of groups with elevated seating. Keep audience camera just over heads when all seated at the same level. If no mixer, make sure anchors go through segments without mistakes. Keep roll-in stories to 3 minutes or less.