I might have a change, but can't verify (yet; I'll try to confirm tomorrow). I'm in Charlotte for the race, and when I was at the track, I was amazed at how poor the signal was. I had programmed the control channels as they're listed here in the DB, but it looks like the primary CC for Concord may have changed.
When I got back to my hotel, I did an Analyze on one of the Mecklenburg County sites that I can receive, and it's showing Concord as being on 852.2875.According to the DB, the primary is 852.7375. I'll try and check tomorrow if this is correct or not, or maybe someone else can confirm before then.
BTW, if anyone's interested, there seemed to be some coordination on Event E1, TG 51971. I think it's mostly SHP, but not sure if anyone else is on it.
EDIT: Actually, I was able to verify from my hotel (sorta surprised me, but I'm pulling in the Concord site with 100% decoding from south of Uptown)... 852.2875 is the control channel for the Concord site. 853.5125 is still the alternate. 852.7375 is still used for the site, just not as control.