The Zend Developer Zone has an announcement about an upcoming conference, the California Central Coast Code Camp, that one of Zend's own will be presenting at:

The inaugural Central Coast Code Camp will be held September 22nd and 23rd, 2007, at the Embassy Suites in San Luis Obispo, CA. [...] Kevin Schroder, podcasting wizard and member of the Zend Professional Services team, (think X-Men without the Spandex) will be speaking on PHP Security and PHP Performance.

You can get more information about the Code Camp from the event's main website.