Thanks for the responses folks! In short, what FunnyBunny posted played out with my situation. Long story short, a while ago we'd taken a snotgobblin camp on the edge of a land bridge where a plains/meadows sector met and repurposed the camp into a farm for flx, barley and for our Lox, Loxanne, built a stone wall perimeter with some towers to keep the snots out. A sertling event ensued, one I couldn't really be arsed dealing with at the time, so I bailed back through the portal. I was initially concerned that the sertlings might attack our Loxen and our barley/flax production, but they just weren't spawning in the base, so I didn't stress too much about it. I went back to our HQ to tinker a bit just to see what might happen. In relatively short order, the sertling attack switched to our main camp where they *could* spawn inside, so I bailed back to the plains to check on the camp and see how Loxanne was doing-- no damage at all, and a happy Loxanne met me upon arrival.

BUT, in the 15 or so minutes I spent running around the camp, checking on everything, harvesting and replanting food, the attack switched back to the plains camp where the initial sertling attack had started, this time as a troll event. And after encountering only a single troll (they really had problems spawning in, so clearly our perimeter defences work!) the event subsided.

So it would seem that, avoiding an enemy event at another camp will likely just result in that event transferring to any other camps you're in.