I do hope you feel better, I know all about back problems.
Thanks.
I made it about 8:30, and saw the last bit of the concert, I walked around a few times, but didn't see any other OCers.
I was just getting ready to leave a bit after 9 when I got a phone call, I stopped to talk on the phone, and midway through my call the cops showed up. Two of them. To there credit though, when they started to talk I gestured to wait, and they did while I finished my phone call, then when I did the conversation went as follows:
Me: Yes?
Cops: How are you doing tonight?
Me: Fine (OK that was a lie, my back hurt, but I didn't see the need to share.)
Cops: What are you doing?
Me: I came for the concert, and got a phone call, and didn't want to drive, and talk.
Cops: OK
That was it, I think they wanted more, but since I was leaving anyway, I just walked away, and they didn't try to stop me, or say anything, the whole encounter once I started talking took about 5 seconds. They did however continue to watch me, and an occasional glance over my shoulder showed them following me about 50 yards behind as I walked to my car.
I generally carry a video camera, but I forgot it, I did however get some cell phone pictures (before the cops showed up) that I'll post in the next day, or so.