From Starwars.com:"Stop by and say "Hi!" to Star Wars author, collector, and Lucasfilm's head of Fan Relations Steve Sansweet at Star Wars Weekends this Friday, Saturday, and Sunday. Steve will be at Wicket's Warehouse, the special store chock full of Star Wars Weekends exclusive merchandise, where he'll also be signing copies of his last two books, The Star Wars Vault and The Complete Star Wars Encyclopedia. The books will be available for sale at the store, and Steve will be bringing along some cool give-aways."
Steve's schedule is:
Friday, June 5: 12:30 to 2:30 PM
Saturday, June 6: 1:30 to 3:30 PM
Sunday, June 7: 12:30 to 2:30 PMClick here
for the full article.
(And while you are there, see if you can pry some Celebration V details from him...)