@DznyGrlSD - I did the race retreat for the half this year. It was something I added a few months after registering for the half because I started to feel a bit nervous about the size of the race and doing it solo (I was also signed up for the 5k, but was to do that with my sister and my DD who is 12.). I was very glad I had because this year's race weekend was COLD. In the end, I also ran the 5k solo because my sister, who is not a runner and not an athlete decided that it was too cold for her to do the 5k (and in all fairness it was too cold) and since she wasn't doing it, I saw no reason for my DD to get up at 3 am for the race. So in the end, by the time the half came around I was no longer freaked out about waiting around solo, but having waited in the cold two days earlier, I much appreciated the heated tent (and the shorter lines for the port-a-potties).
Those porta potties are worth it. And the chocolate milk after running.