Sorry, there isn't one. Send it to The Believer Magazine , just like regular fan mail. I do not know of any other dates than what is listed in the World Tour Center. If a concert date or information about ticket sales is not listed, then it has not been released to the public. All information that I receive about the Tour is posted to Planet Garth immediately.
Some people find it easy to get tickets by phone, while others have never been able to do it.
The phone system will be very busy. You may not even be able to get a busy signal. Don't think that it'll take just a few minutes. Prepare for an hour or so of hitting the re-dial button. There is no guarantee that you will get through, but it is more convienent for those that don't live close to a ticket outlet.