GameEvent for border expansion?

[Danmacsch]

Okay. I'm still trying to figure this out, but I think I'm missing some fundamental understanding of how to use tables. Here's what I think I should do, but without the actual code.

function DMS_DetectBorderExpansion(playerID, cityID, plotX, plotY, bGold, bFaithOrCulture)
	local pPlayer = Players[playerID]
	if (pPlayer and pPlayer:IsAlive() and pPlayer:GetCivilizationType() == civilisationID) then
		print("The borders of " .. players[0]:GetName() .. " has expanded")
		if bGold == true then 
			print("bGold was " .. tostring(bGold))
			local pPlot = Map.GetPlot(plotX, plotY)
			if pPlot:IsWater() and not (pPlot:IsLake()) then
				print("plot is water and not lake")
				local pCity = GetTargetCity(pPlayer, cityID)
				-- run function to convert citizens to pantheon/religion
				DMS_ConvertCitizenToCapitalReligion(pPlayer, pCity, plotX, plotY)
				print("city found -> start conversion of citizen")
			
			end
			
		elseif bGold == false then
			print("bGold was " .. tostring(bGold))
			-- iterate through pCity's plots
			-- if iPlot doesn't exists in table tDMS_FaroePlots then
			-- if iPlot meets specifications then
			-- run conversion function
			-- add iPlot to table
		end
	end
end

In addition to this I should have a function run with PlayerFoundsCity, that saves all the plots within a 3 tile radius. I could of course also choose to only add the water tiles to the table, thus removing the need to check if the plot is water or not.
I'm sorry, but I don't really understand how to accomplish this.