I ended up signing up for the 5K. I'd considered the 10K, but it so happens I hurt my foot the day before registration and I'm not sure of the long term results.

That brings me to my question. When you sign up for the 10K, you need proof of time. If I've never run a race that times me, how would I provide this information? Would they just stick me in the last corral which will then provide proof for the next race?