RFID wristbands have had a growing presence at music festivals over the last few years for a variety of purposes from ticketing to payments to social networking. So they've been going digital for quite some time. But digital wristbands are still an innovation, one to which concert goers are adjusting. Lollapalooza's introducing a new cashless payment system using wristbands connected to credit cards but it's an opt-in system. Tomorrowland is offering a social option with the ability to connect using wristbands if you've linked your Facebook account. Lollapalooza Says Your Money's No Good Here I guess they're not banning cash,...

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