Yeah, I have a Cunning Plan in case it's too wet for pucks. But most campsites are well drained, and many have hard standings available if the surface really is bad. If it's as wet as some expect (and I very much doubt it tbh) then two things come to mind. One is that I'll be more worried about camping in a lake than whether my bike falls over, and the other is that if you pop in your mirrors, it probably won't matter if your bike falls over, since chances are it'll just get muddy and maybe break indicators and levers. Unless it falls on you while you sleep and kills you instantly of course.
I shall add another note to the general sensible suggestions, slightly pessimistic this one, but- if you have spare levers and puncture repair kits, it is wise to bring them. You can tape stuff like this securely inside fairings if you're suitably careful, so they take up no space at all but riding home with no front brake would kind of suck, and it really doesn't take much to snap one off. Hope for an upright weekend but plan for a crash, is my advice
Trust one who knows!
I've got some curvy spares left over so I plan to bring whatever I can find as well as my own, but don't rely on it. Also, duck tape- the small rolls you can buy in camping shops- is a great thing to have, it fixes tents, it's brilliant for fairings, you can use it to protect fairings from bungees or even to tape on or waterproof luggage, and it can be pressed into service as insulating tape, or to attach a small rock to a gear lever to replace a toe section, all sorts of things. Duck tape is brilliant, it's not the best at any one thhing but it's OK at everything, and these rolls are really small
Also, spare gloves- everyone knows to bring waterproofs, right? RIGHT? But gloves get wet too, and there'll be no radiators, so, bring a spare pair.
I shall have the jump leads
This may be overpessimistic, but it could be the difference between ruining your weekend by dropping the bike in the car park or in the campsite, and not. I prefer Not.