1. I usually run indoors on the treadmill. I keep at a pretty good incline (4-5, basically to make up for the lack of wind resistance and to simulate outdoor conditions) through the duration of the run, but still, I know it'll be different outside. It has just been too hot for me to do it outside currently though. The few times I've run outdoors I've been able to keep up my pace fine (I usually go for 11 minute miles), but like I said, I usually run inside.
2. I'm not sure how I'll feel about running with a large group of people like that.
I feel like, in a way, this would be an awesome thing if I could accomplish it, considering a year ago the idea of even running a half mile was horrifying. And I hear races are fun (and this one is for a good cause). Should I sign up for the 5K run or wait until next year when I might be more prepared?