The official iPhone app for the Bonnaroo music festival sent more than 97,000 push notifications to attendees this year, according to stats released by its tech partner. This year’s event saw the festival using Apple’s iBeacons technology to provide “proximity-based messages” to fans as they wandered around the site. App provider Aloompa says that 20% of people who downloaded the app opted in for the push notifications, and on average spent 102 minutes “interacting with content” (in AdWeek’s words) over the course of the four-day festival. Bonnaroo is now crunching all the data harvested during the festival to understand where fans went and what they did, with potential to deliver some of that data back to them. “One of the things that I think every person connects with who goes to a festival and decides to spend four days camping [is that] even if you have consumed no mind-altering substances, you’re not going to remember what you did on Friday on Sunday … just because you’re tired,” said Aloompa founder Drew Burchfield.