So the Town leaders would meet and decide on a community project, then go back to their towns and ask who wants to participate, as to bring as many players as possible ?
So in the list of what we can do, there's of course building projects (the Embassy first of all, and yeah it's written like that I checked xD), but we could also make farms, build a sort of "starting town" for the newbies, and well a lot of buildings.
Tournaments between towns are also an option, but I feel like CODE will have a slight advantage xD
We could also have challenges, like the town leaders make a treasure hunt and the residents have to find it or something