The assumption was: "Anyone could easily choose to switch to hold demonstrations somewhere else, but the result of holding it where only 8% of people will see it will make that less of a choice for the ones organizing the event."

So, no. One square dominates viewership (ie the town square <-> Google). You can switch to another square (ddg) if you want, but you don't get the viewership that you'd want to get the reach that you need.