I think the current setup basically just requires a ton of characters in order for everything to work - Unless they're NPC'd we need Lords/Ladies of every house, which then to be fun probably require a few people pledged to those houses it for roleplay opportunities outside of this particular event, etc. That's a ton of characters needed. Maybe there's some way we can pair it down a bit? Or setup some houses to have leaders who are more background? Or, well, the Ned Stark's of this world who leave the equation early to kind of narrow things down?