Originally posted by Ryzilynt:

Was the OP edited? You guys keep saying "You do" , but this doesn't seem like a logical response to anything in the OP. What am i missing?

He's saying the trigger is you. Meaning you are the requirement, along with where you are in the story. Seems a perfectly logical reply to me.

Now whether this is the full story is a different question. I know that in my game the trigger is you and you alone, with events being triggered and centred on you with zero structures close by, but I am using mods.

For the vanilla game, I vaguely recall you needed to be close to at least a couple of structures as well. Although exactly how many is unclear.