The reincorporated events are just the "historical events" that pop up from time to time, giving you a sense of context by informing of contemporary historical happenings appropriate to the given year. They are controlled by the descr_events.txt file in the imperial campaign folder. While looking at it, I saw traces of some events which didn't occur, since CA hadn't set a trigger date for them. I did a bit of research to find the appropriate dates and set the triggers.