Comment by rapjr9

Note that there are limits to how large a mesh network can scale, it's likely to start running into problems with several hundred users. You can scale larger by limiting data to short text messages, but you'll probably never be able to handle more than 10,000 users, unless you can find a way to create high bandwidth backbone links between clusters of users. There has been a lot of research on this in the wireless sensor network research community and in the WiFi mesh network research community also. A concert going crowd could easily cause a mesh network to become un-useably slow if everyone was trying to use it at the same time.