Probably not the way you're thinking. Just don't start any fights. Polis itself is large. It's the biggest city in the region, and there's a busy market at the base of the tower you'll probably have to go through to get where you're going. All the tribes keep representatives there to run the coalition, so any deals you make with lexa will probably happen in front of them. Most of them were warriors before they were picked, so you'll be around a lot of people who speak english.