The event is going to be outdoors, it is a campus event at a university and there will be two stages. The choirs are going on the smaller stage which is going to be using a Roland digital mixer and the audio is going out through 4 HK Audio Stacks, 2 either side of the stage.
I have been told that one choir will be using music on MP3 which I will play out through 2 monitors on stage, most likely set up to side fill. The other choir will be using at least a keyboard although possible a singing with a big band (Saxes, Trumpets, Trombones, Guitar, Bass, Keys, Drums).
The issue I have more than anything with the two choirs is that they are students doing it for fun which means the ability of singers to project is very mixed. The choir singing to music is very quiet and do struggle to project.
The stage size is 4 x 3 m so I may get away with only using one or 2 mics plus extra for soloists.