Don't let me back out!

I've decided to enter a race. My most recent Fitness magazine had a section on training for a half-marathon. I thought, "Well, I don't think I'd ever want to run a half-marathon - but I could go for something shorter." I signed up for the Cambridge City Run. It's a 5-miler. I've been in "training" for a couple weeks and I'm now up to 3 miles. I just registered for the run yesterday to make it official and so that I don't punk out. I'm trying to convince Chad to run it with me, but I'm not sure he's all that into it. The best part about the race is that it starts and ends a block away from my place!