It makes me wonder if there might be some way to “hack in” to the PA system by way of some wireless device
easy to do with a cb radio & a 500 watt amplifier sitting in the parking lot.....
They used to sell devices(or you could make one from parts) that would allow you to hack into a regular radio and make announcements. It shouldn’t be too difficult to make a device that would tie into an intercom system, and you could probably do it from your car in the parking lot.