No, Lucas has never attended a SW Weekend as far as I know. He doesn't seem to be one to meet his public much. The only time he did was at the tenth anniversary convention, back in 1987 in California.
I would love to meet George Lucas as well. He is right up there with Walt as far as I am concerned.
They could get him at the Grand Re-Opening of a new version of Star Tours!
Okay, and here is another of my ideas, to update that ride. First of all, new movie. Make it in 3D, and for 3D glasses they can give you like X-Wing pilot helmets like in the movie, only these have the 3D lenses in them. Then put mini air cannons inside the vehicles to help simulate battle conditions. They could make the simulator move a little more too, like an actual ride, but keep the simulator part as well. LOL, okay, I'll stop now...