Not sure if this has been mentioned before... What about a scenario where one of the four enemy races breach the cities' walls, or come through from beneath and get into the city. The area where you look down upon the city in the Tower. As a limited time event. It would no doubt take some work on behalf of Bungie, unless they use or build upon existing crucible maps for Earth. But you could either just be killing enemies in the normal fashion until you defeat a boss or it could be that you have to escort civilians or vip's to extraction zones, then clear out the remaining enemies. What do you guys think?