This year's North American LinuxCon is taking place in Phoronix's home territory of Chicago, Illinois. The event is running from 20 to 22 August and taking place during LinuxCon is once again the CloudOpen conference concerning Linux and open-source software within open cloud platforms.
LinuxFoundation.org. We generally cover the LinuxCon conferences on Phoronix and we'll certainly be doing so this year with the event just being a few miles away (well, by August, Phoronix will have likely located to Indiana, but still it's close enough). XDC Chicago Preview from 2011 and the XDC2011 Chicago recap from when I was the organizer of the X.Org Foundation's annual conference.
All-access registration for the event is currently at $600 USD and available via events.linuxfoundation.org.