Never done night riding, except when a ride takes too long and night comes early, but it sounds fantastic. Something that comes to mind though is that a lot of people would be new to night riding, and as we all know from the car, extra care has to be taken when driving/ riding on artificial lights. Will the other riders take the care necessary? or will they just suck you into trouble.
I must admit that bike security is not something I think of. If I am not sitting on it, my hand is on it, but a good "D" locks and cable deter many people from borrowing your steed. That is what I use in my garage for the 5 bikes that are there. They want to take one- they take the lot and the reinforced bolt that is 6" in the floor aswell.

I am contemplating a night ride, but for any of you that know my riding- It will be on the Tandem, and it will be off road, and it will be on the South Downs Way. Details at http://www.trailbreak.co.uk/maxx_exp/
But I have a problem that some may be able to answer. 8 hours riding and we need good lights and plenty of battery power. We think we have that covered but How about Emergency lighting? If our main system packs up we will need a backup. It must be lightweight, it must give us good light and it must not cost a fortune.
Any ideas? Both for me and Hiyo Silver, as I should think it will be one of our priorities. Riding at night may be a problem, but NO lights will make it more difficult.