You should definitely try to get her to send an invite to him.
Smaller cons like that are the best. The more personal a con can feel, the more likely it is that people will want to go. Of course, this leads to a more crowded con, years down the road, but that's the nature of the beast.
Oh man, I feel bad for that guy. I would hate to stand for so long, and sign so many things. Okay, maybe not the latter, really. It seems like that would be the best thing for an author/artist, to have someone bring in that many things, even all at once. Knowing that someone had collected that much, and wanted it all signed, seems like it would mean a lot. So, rewarding, probably worth the hand cramps. (Don't like thinking of those, though.)