I'm trying to pull together some interesting factions (with Xenotype Control) for my first SOS playthrough, so I want to know which factions to populate with advanced aliens. I'd take any suggestions on cool factions and xenos too (leaving aside Star Trek and Star Wars xenos).

Are there events in space that interact with other factions? I presume when you're under attack or attacking other ships you'l be interacting with the "Pirate gang" faction, but are there others, or any sorts of refugees or traders who visit you in space?