Not at this event Bytor, We closed a portculis and blew up a bridge to stop infected citizens spreading into the city. Some citizens had blue books on them, but they aren't 'uber rare' as such and you will get more chances to find blue books on future mobs and also the raiders that raid cities.
I have a request about this.
I participated to the Event, but due to lag (too many players at once in the same close location), I was always too late for the looting and ended up without even a single "souvenir" for my participation to the Event.
Unless the system gets changed, I do not expect that future participations will allow me to get any of the blue books or other particular items because I will face the same problem of lagging as compared to other players and, therefore, not be capable of picking up the books or whatever other item of interest will be on corpses.
I'd rather prefer a clickable statue at the end of the Event which gives the possibility to all players who attended to get their token of participation. In such a way, noone will be missed as the current way, instead, unfortunately does.