We've been offered a booth at USENIX. The conference itself runs June 1st to June 3rd; on May 30th, they'll be training, but no expo.
The LinuxWorld experience was enjoyable for everyone concerned; doubtless, USENIX will be as well. Following the LinuxWorld example, I've put up a schedule for volunteers, if any, that might be willing to man the booth. Manning a booth, even for a short while, is a lot of fun; you can answer questions and meet interesting people. And, of course, anyone is welcome to stop by the booth and commisserate, whether you've volunteered or not.