Well, there's PHP Conference http://phpconference.com And also Northeastern http://www.northeastphp.org/

I don't know of it's too late to get tickets yet since these are late October and September. It's good to check up on these early in the year, just in case.

Edit: On Northeastern, you can check out last years highlights to see if this is what you're looking for http://2013.northeastphp.org/