PlayBoston: The SIGGRAPH Solution

 
The first part of the challenge: find 3 clue cards hidden among the many booths at the SIGGRAPH Expo on August 1-3, and also hidden around Boston at various locations. For those who wanted to play along at home, patience proved a virtue, as the puzzles were also printed over four days during the conference in the Globe's Sidekick section.
 
The main playing field for the treasure hunt was SIGGRAPH, where all of the sponsors incorporated hints into their exhibits.
Videos playing at the CreateBoston booth (and on Boston.com) provided hints about the locations of the clues.
The careful observer might also have noticed these guys wandering around offering a little help...
... or maybe these two...
... but not this guy.

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