Looks like there has been a bit of confusion surrounding your registration options.  Here is the current updated info:

• Online registration has been extended until Fri, Oct 16. This is a great option for you intarweb addicts; quick, easy, and painless
• Pre-registration @ Chainwheel will happen on Saturday October 17th from 2-6pm. This is another nice option. You could even thank people for helping put on such a fantastic event.
• Race day race day registration will run from 7:30-11:30am on Sunday, Oct 18. Not the best option as it could severly cut down on the time you have to cut up and psyche out your competition before the race.

So that should be the most up to date registration info there is. Sorry for any mixups.