Iv'e been to Celebration II and III, and they were a total blast. Not only do they have autograph opportunities (I personaly don't worry about autographs myself) but they have presentations where some of the stars do a QA. I really enjoyed when they did that for Carrie Fisher, Billy Dee Williams, and "the bad girls of Star Wars" with the acresses that portrayed Aura Sing, Zam Wessel, and one of the girls in the background of the cantina in ANH.

The stuff with Nick Gillard and Ray Park was really cool. And so far there has been stuff to do each night, with one official Star Wars Celebration party, the 501st pary, and other fan organized parties. Not to mention the whole town ends up with stormtroopers walking around all over the place.

Then there's the costume contests. It's almost worth the price of admission just to see so many brave hot women dressing up as Slave Leia or ripped shirt Padme.

If you like Star Wars, it's really worth checking out, even if just for a single day.