LARP Recomendations
Here's some ideas from the LARPs that I have played in:
Each character should have two major goals and three minor goals. For a game lasting 8-10 hrs, it should take 1-2 hrs to fulfill a minor goal and 6-8 hrs to fulfill a major goal.
Each character should have ties to about 20% of the other PCs. Whether this is because the characters are from the same clan, guild, nation, whatever. Major rivals might also be identified.
There should be limited resources available. If the Athenians, Egyptians, and Persians need tin for bronzework, there should only be 2 units available. This will encourage discussion and bargaining. And, when the third player discovers his people have no tin, that's OK, be cause her has four other goals to work on.
Look up some political discussions. The Council of Nicea, where the ideology of the early Christian church was codified, is a great example of numerous factions getting together, some big, some small, and working though politics to achieve a goal. While you can't use that exactly, it should make for some great inspiration.
I played in a game of How the West Was One, a fun game based in western Glorantha. (RuneQuest) Looking over a copy might be a great first step for you.
You must put Glorantha with How The West Was One other wise you get losts of other garbage.
Baron Opal