I volunteered to provide the sound for a large school fair happening in May in my town. Its like a carnival. The performance area is outdoors on blacktop with a large mobile stage and audience of 50-250. I own the local music school and have a decent PA - Carvin 12 channel mixer with two 15" active main monitors and three 12" active floor monitors, plus all necessary cables, direct boxes, and a bunch of sure 57 and 58 mics, stands, etc. I thought this would be all we'd need because most of the acts are either local music schools with a student band playing (only vox mic'd), solo performers and karate/dance schools performing to a backing track. But now I just learned that the local middle school and high school jazz bands and orchestras will be performing as well. I've never done any kind of sound for this size group and don't know where to start to mic them properly. What mics should I use, if any, to capture this? And do I need to worry about phase issues? I was thinking 3 Rode NT1 condensers at left, middle and right of the stage plus a few 57 dynamic mics placed where soloists could stand up during their solo would do it, but its an outdoor show so I'm worried about wind, weather, feedback, phase, etc. Please school me on what I need to make this event work? I don't mind investing a little money in mics or equipment to get it right.