Just 2 SM58 coincident pair at right angle to each other can cover a PA concert

It was tried at Castaniani village of magestic view in the north part of Hellas, full of maintains and super clean air. Shure SM58 has no bass boost proximity effect (ie frequency respone is getting flat) at say a distance greater than 1 meter. So mics were placed in front of conductor, singers were placed about 1 meter away in center, behind them there were acoustic or amplified instruments, behind them a choir. Each PA speaker was placed behind each mic, so that feedback would be minimum. The venue was outdoors on a magnifiscent August night. The Yamaha if memory is correct mixing desk was only used as an amplifier with perhaps a bit of reverb. Roadies were very releved that they had so little to carry. Everybody was happy after the concert and congratulations were given...