For heroically looking like an idiot in front of clueless stall holders, waving the pictured card about and asking "Got any stickers for this?"
The idea was you took the action figure carry case style card around the event and located the 12 stall holders who held the stickers. On return the completed card you were given the Boba Fett sticker plus the medal thing. Good fun if not a little frustrating at times! It certainly got you talking to other fans who were doing it and that was cool.
Just finished up my display for the set of 30th anniversary coins. 2 bits of 3mm MDF with the top one measured and drilled with 41mm holes. Glued together and a piece of 2mm custom sized perspex from eBay bolted on top... plus a bit of lettering.