I have a fair amount of experience with this particular con, and here's the thing: with fairly "big name" guests like this, you don't have a chance in hell of meeting them. And I'm guessing, at this point, even though Who still has a fairly low profile in the U.S., that Tennant is considered a "big name." This con is attented by upwards of 100,000 people, per day -- it's the biggest media con in the States. Even on a "light" day, it's almost impossible to breathe on the con floor. People are packed in like sardines.

And here's the other thing: if the guest is remotely "big name" -- they'll be signing for about an hour. Two, tops. This isn't like a regular "friendly" con where the guests hang out all weekend and get decent face-time with the fans.... this is hit-and-run, and mainly just so the con people can say, "Look at all these great guests we have." So, 100,000 attendees -- probably at least 15% of which have watched enough Who to want to meet Tennant, even if they aren't Fans Like Us -- and two hours of signing time, with MAYBE a Q&A session in a room that will hold 500 people at most. You do the math.

So, don't fret too much ladies -- unless you have an "in" with somebody at the con, chances are you wouldn't be able to get within a half-mile of the boys. (And Julie.) :)