The 467.1625 came back to a BearCom license. That jogged my memory about the BearCom system that you found for the Honda Indy and the Toronto International Film Festival, previously.
It sounds like a transportable system they use for big events. I bet the radios all use the same TG as well and the use of the TG depends on the event it's at.
The Goodyear blimp is flying over the event as I was told by my wife when she was driving near the RBC Open. I was too busy to monitor today, will give it a shot tomorrow if weather permits.