Both the details about the conference and the Call for Papers have been announced about this year's TEK X conference happening in Chicago, IL:
TEK X is a great conference event for professional PHP developer. It takes place in Chicago between May 18 and 22 and hosts tutorials and sessions from some of the best speakers in the PHP market. We're currently accepting proposals for talks; the Call for Papers is open until November 23.
The TEK X conference will be at the Sheraton Gatewy Suites (near the O'Hare airport) and will take a broader focus than previous MTA conferences - this time they're encouraging presenters to "think outside the box" and not just limit themselves to PHP-related topics. They're also looking for advanced programming techniques, development/management practices and talks on similar technologies.