Where and when, in history, did the first democratic election for a government occur? Probably simple, but can’t find it
This depends greatly on how you are defining democracy.
The Greek city/states had democratic elections, but voting was limited to “citizens” who were a subset of the native adult males. Women, slaves, emigrants, and others were barred.
I’m not sure when the franchise was first extended to virtually everyone of proper age, as is more or less the case in the U.S. today. Some of the territories allowed women to vote by the 1870s, by which time land ownership had been eliminated as a pre-requisite for voting and blacks also legally had the right to vote. I’ll bet Chinese couldn’t vote, though.
Democracy in Greek literally means rule of the citizen body rather than rule of the people. Many people would say that the first true democracy was the Mideival government of Iceland, which worked by a parlimentary system.
From here:
http://www.iceland.or.jp/Files/iceland/his.htm
There are many examples in different times and places even before the modern era where some degree of local political power was held by a tribal council of some sort where every adult man was supposed to be allowed to speak. This was true through much of Scandinavia.