I don’t think I saw it before, but there’s a list of speakers and events up for vBSDCon. There’s no DragonFly-specific talks, but there is a presentation from Baptiste Daroussin, one of the people behind pkgNG, which is used to create parts of DragonFly’s dports framework.
It’s positive to see a BSD conference sponsored by a company that’s not selling a BSD-specific product. It’s happening in about a month and a half, October 25-27, in Dulles, VA.