There will be lots of people who are out to fund raise that don't have much cycling experience, and some of those willstylo wrote: Is there usually a clear enough path when riding up the inclines or will there be bodies with bikes littered everywhere (me possibly being one of them LOL).
find the hills too difficult. Some will stop before they get in people's way, others will try to struggle on and fade into
unpredictable death wobbles. You just have to be aware enough to give them plenty of space - and there's usually enough for that.
It's not a race, but there will be some riders treating it like that who can threaten everyone else's safety by invading the space you're trying to give the less confident riders. Inconsiderate riders can be every bit as unpredictable and dangerous as the strugglers.
This year, it looks like they're going to control the descent into RNP at Waterfall with Police escorts, and that might make the climb from the Port Hacking River up to Stanwell Tops a bit more congested than in the past. Waiting for the crowd to disperse might be a good tactic there.
If everyone takes a large dose of patience with them for the ride, nobody is gonna get hurt and we'll all have fun.