I admire the effort you've put into the game with event development, but how can you ensure that what happened in Kappa a few weeks ago won't happen again? It looks good in writing, but in practice it could be very different. I propose that the event be carefully reviewed so that it's enjoyable for all parties. Suggestions: Make it longer and with fewer parties involved (putting four factions into a single system for an event is too much; it'll be a mess). It could be subdivided into stages with fewer factions involved.
Think about it, and please—and this wouldn't hurt—contact the leaders of the factions involved, have a meeting. We're all grown-ups (I believe so...), we all have a life behind the game, but I trust you can reach an understanding so this is playable and fun.