6 different factions already involved in this one event.
There's nothing saying others can't interact within their roles with those factions used for this event. In fact, it is encouraged, as activity is the whole purpose on creating such events.
My hope with events going forward is to make them frequent but not overwhelming to produce. To do so, limits must be imposed and some groups that maybe could have been included may not be.
I'm hoping the standard "Is there anything happening in Disco this week" will soon be replaced by "What new events are taking place in Disco this week?".