I can understand your frustration. I have no way to confirm that a Light is actually a Dark. I have to go with what I can see, which is a whole party of Lights refusing to follow the rules. However, if that's what happened, please send a ticket (say its directed to me) and I will look into that. If they were indeed trying to sabotage the event, I will deal with them appropriately.
Either way, I will run the event again early next week. I'll post details when I get a time set aside. Sorry for the trouble guys.
Again, if there were players ruining the event on purpose. Report them (in a ticket! Don't post it here!). I'll deal with them personally.