You don't need to list phone number or email address in your post; just ask people to private message you. (You can even ask your Profile to email you when you get a message.) Leaving up either bit of information could subject you to spam, etc. You have only a little bit of time to edit your post, but after about an hour a forum moderator could edit it for you.
If you click on "Regionals" from the main Burning Man site, then on the United States, then California, you can see how to get in touch with a lot of different people in California, including SF.