As far as levels go, the vast majority of dogs are in the elite level.
Off the top of my head I would say at least 80% of the side runs are at the elite level.
The vast majority of the time the courses are built, they will be at the higher levels. And then we'll go down once we have reasonable belief that we can, whether that's because all the elite dogs have ran, or we know the dogs who haven't run aren't going to be coming around.
The most important thing to remember is this.
It's the side runs. It's very relaxed. The people are very nice. And we're very accommodating. Just check in with the folks running the ring that day, tell them when you're running and they can probably tell you everything you need to know.
Sadly unless we tried to coordinate the side runs with the main rings, they just have to be a bit fluid and done on the fly. Which is why it's very relaxed and 'come as you please'