From the official site
Have an awesome vintage item? Maybe a really cool limited edition Star Wars collectible? We want to see it! Bring your treasure to the Collecting Track room (Halle Ruhr) and show it off before hundreds of other collectors during the three days of the show.
Your collectible must be small enough to fit into a standard counter-height display case and it will be locked up while on display. While you’re at Celebration Europe, make sure to stop by and view what promises to be some truly amazing treasures.
for details on how you can register to showcase your prized possession.