Quoting Jesse Zbikowski (embeddedlinuxguy@gmail.com):
Interesting idea. Do we have to be registered attendees to hold our meeting on site? I might try to crash the BOFs at 7pm anyway.
Let's find out how much the discount is. They don't seem to offer any free "exhibits-only" passes, so it looks like a minimum of $380 (non-member) to walk in the door. I'll email Ms. Peterson unless somebody else wants to.
http://www.usenix.org/events/usenix07/registration/registration.html
I have no information from inside USENIX Association to offer, but can report that the one _prior_ USENIX Super User Group Meeting, in which a bunch of LUGs participated (20045?), was held separately from the annual conference, and was entirely free of charge.