From the StarWars.com SDCC Exclusives Checklist
The Star Wars Celebration pin trading program starts at San Diego Comic-Con with the X-wing Luke Skywalker pin. Purchase a Star Wars Celebration Anaheim ticket at the Lucasfilm Pavilion (Booth #2913) and receive your pin at the show.
The Star Wars Celebration Anaheim Pin Trading Collection will feature a total of 45 unique character pins, designed by artist Christopher Lee. Some pins will be available for sale or trade at Celebration, while others will be available online, exclusively for Celebration ticket-holders.
This set stands to be quite the challenge to complete, so good luck to everyone who attempts to put a set together.