That looks like it will be a really fun race. I would have also run it (the 5K), but it's the week after the Philly marathon, so I'm out. It also ticked me off that they don't have day-of packet pickup for that race and i didn't want to drive to the national harbor 2 days in a row! BUT, it looks like it will be a good time!
Good luck! That's a pretty lofty 9 mile time!