oops - sorry I missed it - June 4 - 6 too
Here is Disney's page
http://disneyworld.disney.go.com/parks/hollywood-studios/special-events/star-wars-weekend/
Enjoy!
2010 Star Wars Weekends Schedule
Weekend 1: May 21 - 23, the actual 30th Anniversary of The Empire Strikes Back
Temuera Morrison (Jango Fett)
Daniel Logan (Boba Fett, Episode II)
Dee Bradley Baker (voice of Captain Rex, Star Wars: The Clone Wars)
Weekend 2: May 28 - 30
Matthew Wood (voice of General Grievous)
Lorne Peterson (Chief Model Maker, Star Wars Saga)
Tom Kane (voice of Yoda, Star Wars: The Clone Wars)
Weekend 3: June 4 - 6
Billy Dee Williams (Lando Calrissian)
Ray Park (Darth Maul)
Dave Filoni (Supervising Director, Star Wars: The Clone Wars)
Weekend 4: June 11 - 13
Ray Park (Darth Maul)
Peter Mayhew (Chewbacca)
James Arnold Taylor (voice of Obi-Wan Kenobi, Star Wars: The Clone Wars)