Don't beat yourself up too much. An event this size and scope is extemely ambitious, especially for your first one out. You definitely needed more time to plan and get volunteers and drum up interest. Also, you really have to stay on top of your events - they won't host themselves.

That said, I still think this is an excellent idea that warrants revisiting.

Well, thank you guys for support. I must say that any motivation to continue on this fades away every day, since I still don't have time enough to write down everything.
If everything would go better, there will be rules for a race and sign up board soon.

(If I won't make it this week, then probably never)