At the end of this month (August 29th and 30th), there's a PHP event happening in San Francisco, CA that calls itself a "unique gathering of exceptional PHP developers from around the globe" - PHP: The Undiscovered Country. This two-day event includes speakers like:

• Nate Abele
• Graham Weldon
• Garrett Woodworth
• Dean Sofer

The sessions are covering things like the future of PHP application development, working with virtual teams, the HipHop VM and future-proofing your APIs. You can still pick up tickets for the event too. So far they've posted the Day 1 schedule to the site with more information (and other speakers) to come.