Before the convention started a spaceship with a very important cargo was invaded by aliens who have stolen the goods. In its last moments, before disappearing, it transmitted an encrypted message as to its location.
Attendees have to solve a number of puzzles to locate the precious cargo - each appearing as a QR code scattered about the convention. When scanned, it brings up a link to a riddle or say-what-you-see puzzle that will help you. When you solve the puzzle, it gives a letter - gather all the letters and the location of Brok's precious loot is revealed and you can share in it too.
This is just a little fun idea that I thought would be good fun as a game throughout the convention. The prize would be something small (knowing Brok, it might just be cookies).
