Okay, I was short before because, Ironically,it was almost time to start the Masks game I'm running.
In a city other than Halcyon.
So... I can assure you that there is nothing on a game level tying it into Halcyon city. The default (very loosely defined) setting and the limited fiction all involve Halcyon City, but they're nothing that can't be ignored, like everybody does the default D&D setting.
To quote my PCs at least once a session: "Fuck Halcyon City. Those guys are stuck up pricks."