I'm curious to see if there will be a side event happening within PAX West this year. On my first visit(2012), my brother introduced me to an event where people wore a special badge on their arm with specific shapes, colors, and letters. When you registered for this event, you were sent a badge and a smaller card with a different set of parameters to find. If and when you found your target person, they were out and usually you would get a small swag bag from this person as your reward. The bags were custom built by the individual (usually up to $20 worth).
Sorry, it was loads of fun. I would like to see something like this again.