Would be a great idea, except they couldn't even operate WiFi with any stability (to which I heard was a LVCC problem, but I don't know that for sure).

Doesn't have to be wifi. There are many different ways to communicate. It's a matter of finding the best one. Unfortunately, the largest drawback is the potential for malicious/mischievous actors to interrupt them given the crowd. Something as simple as FM transmission, like at a drive-in, could be an option.