This is really helpful. Thanks.
I'm finding prety much the same here too.
Do you know what agency is using stac 8? Msp, sheriff, sppd, etc? And how it is patched? It seems that when the fair closes it has regular patrol traffic, e.g I heard a unit trying to catch up to a car, and calls being dispatched. Then as soon as it opens again the next day, it's fair related only.
I don't think it's a specific agency. The STAC TGs are supposed to be programmed into most radios on the ARMER system so any users that need to communicate can switch to a bank and access that TG. That's where I think I am hearing officers keying up on the SF TGs instead of where they are supposed to be working on this week.
As I was typing this there was a radio check on SF 3. For one voice, the most recent and frequent TX has been on STAC and SF talkgroups, and several Ramsey County LE talkgroups. The response came from a radio ID that has only been seen on STAC 8/9 in the last 90 days (Probably the console). If I had to guess most of the radios in use are from the Ramsey County or MSP/Statewide radio caches, and spend most of their time packed away in Pelican cases.
It's highly likely given how traffic intensive the fair is as a city within the cities, they aren't patching anything at all unless it becomes a true SHTF situation. Day to day, users are expected to operate directly on their assigned STAC.
To your last question, since the fair is primarily covered by MSP and RCSD it's likely an officer cleared from the fair and returning to normal patrol simply didn't change the car/portable radio back to the home bank. If it was a traffic issue that started in/around the fair, it's possible the call was intended to be handled by thier dispatch console on the fairgrounds anyways.