I run a large (20+) person Chronicles of Darkness larp. Our story centers primarily on rebuilding the Night Congress, a supernatural organization that keeps the peace between the large population of supernaturals in Saint Louis. While it makes sense that there's only about twenty supernaturals in Saint Louis, we've established canonically there were upwards of two hundred in the past.
If an issue gets large enough in the city that it effects the community as a whole, the Night Congress is compelled by the city spirit (who feeds on the energy created by this accord) to call a general vote. Each individual is awarded a vote, though werewolf packs generally cast their vote as a bloc.
What is an effective way to simulate this situation, while ensuring that NPCs take actions that make sense with their established goals and agendas without taking too much time out of the game?