Uh Oh!! Sounds like a lot of people headed to MGM for Star Wars on opening weekend. As the others have said, usually the main bulk of the crowd is over near the Star Tours ride. In addition to the celebrities, there are a lot of costumed characters (Darth Vader, stormtroopers, wookies and warriors) walking around and in certain places doing autographs and pictures. If you have a small child that might be frightened, you might want to avoid this area, some of these characters look pretty scary.
I just bought FL resident Play 4 Days passes so I could take my son on 4 of the Sundays to meet the celebrities. He's very excited that the first weekend will be Anthony Daniels (C3PO) and Billy Dee Williams (Lando Calrissian). On one of the websites it suggested that Natalie Portman might be there, but when the final schedule came out and she wasn't there, my son was very upset.
A hint to all of you looking to get autographs - get to the entrance EARLY!! What the CMs have done in past years is to give out paper bracelets with a number on it, this is your place in line for a particular celebrity. These bracelets go quickly, especially for the big stars, so get there early and walk around looking for the CM giving these out.
Have fun and maybe we'll see some of your there!!