So if I am planning to run with two other people, how do we register to ensure we all are in the same corral? I have no idea how any of that works. Thanks!
For the 10k, you can submit an expected finish time. If you're doing the 10k, you can all submit the same expected finish time.
For the half marathon and challenge, you have to submit a proof of time from a race (10k or longer) that took place within two years prior to the race (so February 2019 or newer). If you don't submit the POT, you will likely be placed in the last corral. If the three of you submit similar times, you will likely be in the same corral. Keep in mind that you can drop back corrals, but you can't move up. For example, if the three of you were placed in corrals A, B, and C, the runners in A and B could drop back to be with the person in C.