http://cfp.madisonphpconference.com/
If you've never presented at a conference before, sometimes a smaller regional conference is an easier way to get started. Madison PHP is one day (Saturday, September 13th, 2014) and seeks talks for attendees at all skill levels. And their speaker compensation package includes complimentary airfare/travel and hotel.
I suggest you submit talks: * on MediaWiki extension development, like http://opensourcebridge.org/wiki/2014/Extension_Development_with_Mediawiki (slides available) * on HipHop and HHVM * on coding conventions https://www.mediawiki.org/wiki/Manual:Coding_conventions/PHP * on how you do code review
The proposal deadline is Monday, July 21.
Sumana Harihareswara Senior Technical Writer Wikimedia Foundation