I think the easiest way round the whole thing
But why would organisers want to get round the whole thing? Surely they want their riders to have a good time and get round safely?
I've not organised an audax, but I lead club rides from time to time, and I try to think about the risks and take steps to ameliorate them, as I'm sure every leader does.
* Risk: rider hit by motor vehicle. Response: pick routes that don't use too many busy roads.
* Risk: rider injured due to pothole or other surface hazard. Response: signal hazards; take it carefully on descents where road surface is poor.
* Risk: rider bonks, gets hypothermic. Response: make sure ride has enough café stops for the distance; check cafés are open; carry bonk rations.
* Risk: rider has heart attack or stroke. Response: carry mobile phone; know basic first aid.
* Risk: rider gets separated from group; gets lost. Response: go at pace of slowest rider or wait for group to catch up at junctions; check that new riders know how to get home at end of ride.
It's basic common sense, not onerous, and I'd be devastated if someone was hurt on a ride I was leading.