The project "Crowd Hopper" focused on a solution to the idle times at the concert/event venues, like the waiting time before the show or breaks during the show. The team came up with a guitar hero-kind-of-game for crowds! The crowd was clustered into different groups and each group was assigned a colour. When the group's colour note hit the bar, everyone jumped. Just like Guitar-hero.
To achieve precision in location the group used ibeacons and to detect a jump they used the phone's accelerometer.