I think the NitroJam crowd will be fundamentally different from the crowd that will show up for nitro testing. I bet 90% of the NitroJam crowd will have no idea of the Nitro testing the next weekend until they hear it over the PA, and then PBIR will get what they want, a quick return fan.
It looks like PBIR is a 1320go.com track, if so the timesheets will hopefully show live (and be available for download) for those who subscribe to their "all tracks" option. I could easily see this not being turned on, but hopefully it will be.