I would rather they let as many register as want to run.
There is nothing today to prevent that option.
Tags? Print on demand. Even with these numbers.
Porta potties? You have to think of that whether they pay and run, don't pay but run, or stand and watch.
Paperwork? Please. Computers and networked smartphones. There can be an app for everything.
Medical standby? See the second item.
So I stand by my insistence that if you are going to do it on public property make it open to everyone with the entry fee.
If you want me at OWS, that means you are ACORN. I voted against your boss and I already have a job.
Bunch them in manageable tranches and send them out every 15 minutes. Send the elites out first. They are already timed automatically when they pass through the start and end lines. There is no reason to start everyone at the same time.