The way it works is every time the server starts it picks a random event in random location. There can only be one event at a time. That event will stay until someone does it, then another one (or the same again) will pop somewhere. This is easily visible in ConanSandbox.log, example:
LogLevel: ActivateLevel /Game/Maps/ConanSandbox/Events_Testing/EventLevels/Event_Witchhunt_03 1 1 0
when event is done it will show:
LogLevel: ActivateLevel /Game/Maps/ConanSandbox/Events_Testing/EventLevels/Event_Witchhunt_03 0 0 0
After a few seconds another will pop like this:
LogLevel: ActivateLevel /Game/Maps/ConanSandbox/Events_Testing/EventLevels/Event_Blowback_01 1 1 0
etc.