You've mentioned the Olympic Games which would be taken into account, but what for a variety of other games such as the Panathenian (sorry if the spelling is wrong...) games, the games held in Corinth and various others?

Also: will theatres be included with this mod, just like in XGM? If so, I suggest you take extra care of the theatre in Epidauros: it's located just to the south east from the place they worshipped Aisklepios. In fact the road from the city towards this temple is/was the same as the road to the theatre.

As an extra historical source I'd recommend you read Herodotos' Historia. It can't be hard to come by an decent translation, and if you happen to be able to read ancient greek you can read Herodotus relatively easily.

And at last: good luck with this mod, and keep up the good work!