There's some unfortunate news from Greg Beaver today on his blog:

Some of you may have noticed a power workshop on PEAR advertised on the website of the S&S PHP Conference in Frankfurt this coming November. For personal reasons, I have been forced to pull out, so I'm sorry to say I will not be meeting any of you in Germany. If you're going, have a great time there!

For more information about the rest of the offerings that will be at this year's conference, check out their official page, specifically this page for the Power Workshops.