Take a look at any of the JSConfs, particularly the national one that was most recently held in Scottsdale.<p><a href="http://jsconf.com/" rel="nofollow">http://jsconf.com/</a><p>Most of the JSConf events are well known for their quality and are specifically for developers. They tend to sell out fast.
Lanyrd is the place you should check out.<p><a href="http://lanyrd.com/topics/web-design/" rel="nofollow">http://lanyrd.com/topics/web-design/</a><p>I'd recommend An Event Apart, Breaking Development (BDConf), and dConstruct.
Heard good things about the Build Responsively workshops, I'll be at the Cleveland one in August <a href="http://buildresponsively.com/" rel="nofollow">http://buildresponsively.com/</a>