Nice idea, but a couple of intrusive permissions required for installation This app can read your phone status and identity Which means that "Allows the application to access the phone features of the device. An application with this permission can determine the phone number and serial number of this phone, whether a call is active, the number that call is connected to and the like." It can also find accounts on the device, directly call phone numbers, has full network access. I doubt that the information is being used for nefarious purposes, but a simple app shouldn't require so many permissions to operate.
Great App I've gone to this fair every year for more than a decade. It's always a must to grab a map and schedule when you arrive, and now it's right on the phone. Will definitely come in handy!