XDC2011 is being organized by your's truly and is running from the 12th to 14th of September. The venue is the Illinois Institute of Technology on the southern-edge of downtown Chicago.
The program (see the Wiki page) is still very much a work-in-progress, but at the moment it looks like there will be talks on multi-touch, XKB1.1, auto-regression analysis, Nouveau, and a DRM overlay-plane API. There will also surely be other talks over the three-day event, but that's waiting on the X.Org developers to submit their session plans. I'll also likely be announcing some driver automated testing / performance monitoring work at the event as well (that comes out of some Phoronix Test Suite / OpenBenchmarking.org research work with Intel supplying the hardware).
Additional details on the XDC2011 event can be found on this Wiki page. I'll be posting live to Phoronix any interesting bits of information from the event. The day after XDC2011 ends, it's then on to Oktoberfest 2011.