How many factions / NPCs is too many?
I'm pulling together an idea for a game with a heavy focus on faction politics. Current plan is, the PCs are trying to keep things orderly during a grand festival, but all the PCs have their own plot(s), ranging from "Smile and Wave" to "Make It Look Like An Accident." The challenge will be in choosing which faction / plot is most dangerous, and taking care of the biggest threats first.
This is my first time really playing with factions like this, though, so I'm a little nervous about how this will all work. In particular, I'm wondering--how many factions / NPCs is too many for the PCs (and/or myself) to keep track of / play around with?
For reference: at present, I'm imagining somewhere between 4-6 different factions, each with 2-6 major NPCs, arranged around roughly three different ideological axes.