According to the F.A.Q. the only things that are constant about an adventure are the number of events and the final event. Then there are keywords for an event that mean it will likely be one of two characteristics - but you can't know that in advance since they're mostly random. I've noticed, replaying several adventures a couple of times each, that there are several events that remain the same so that maybe a quarter of the events are the same, but you don't know which ones until you play the adventure a second time.
