I spent a lot of time at lake Park for pokemon go almost exactly a year ago! It was basically a huge party and a great example of how AR could bring people together.
I was traveling a lot through the Midwest last summer and there were hoards of people staring at their phones while actively walking around in about a dozen states.
It was wonderful to watch.
I can't wait to see what form of communal AR we see develop over the next 10 years.