1. I want to say it was somewhere between 100-200 participants last year. I could be wrong. That doesn't mean they are all out at once though. First lap is the most crowded since everyone starts at once. After that the field gets spread out and there can be times when you don't see another rider for a mile or so.
2. People are pretty good about warning before passing. This is a very friendly event.
3. Expect to have fun. If it rains a lot the day or two before...expect to get wet, muddy, exhausted, and have fun!