Streamlining and Testing RFID Technology
Multiple readers have written to let us know that an experiment at the upcoming Hackers on Planet Earth (HOPE) conference will use RFID to track the movements of at least 1,500 registrants for the duration of the conference. Those movements will be transmitted onto screens which "show in real-time where people go, with whom they associate, for how long and how often." The system will also be used for games which involve manipulation of the available data. Meanwhile, researchers at the Georgia Institute of Technology have developed a method for testing large quantities of RFID tags, which may serve to greatly speed distribution.
At random intervals, pick a stranger and offer to swap tags. You could even devise rules for doing this in groups...
Games could be invented involving your favorite randomizers (dice, coins, chicken bones, shots of whisky) to spice up the action. Sounds like fun to me.