Should be a good event, I am looking forward to there NDW 100/50/MARA races this August, I should be doing the 50 or the Ridgeway 85, unfortunately family commitments rule out the NDW100.
In my experience, on an event that involves going through the night you are hopefully going to end up running with someone of the same pace and this becomes your running buddy/pacer and the aim is to keep each other going. Running through the night on an Ultra is something that you may find OK and you just tick along and don't fall under the spell of the sleep monsters, and when the sun starts to come up you start to come back to life (anti vampire is how a friend describes it). The hours of 2am to 5am are the worst as your body really wants you to sleep, being in the best physical shape you can will help, but it is a lot about mental strength as well, and not dropping your guard. Other than that, train hard and race easy, Just my 2 pence worth.