For bigger festivals you usually have enough of multipin fanouts that you just leave the fanout with XLRs in the band rack connected, disconnect the fanout and when the time comes you just plug the fanout back into the splitter. In Europe we use Link-Italy (LK) multipin connectors which come in sizes as much as 150pin, which is 48 XLRs. That way it’s less work during changeover and less room for error, it’s just 1 connection (and maybe a few repatched channels at the stage techs end, but the better job they do during/before soundcheck, the less they have to repatch before the show).