The app seems pretty feasible. There'd probably be some issues with having to periodically resync the timing due to moving microphones or other skews coming in and out of phase but I don't imagine that'd be insurmountable.
The bigger trick would be getting various parties at any given event to help out by first recording and then submitting their data to the same collaboration service. I've seen enough rooms full of techies struggling to get a projector or conference call working to imagine all kinds of headaches with connectivity, app installation, finding the right event reference, etc. If you allow post-event submission, most people would probably forget or not care by the time they got back to their home networks only to be annoyed weeks or months later that they still have a large audio file taking up space on their device.
As more people are posting various captures (just for personal-reasons/vanity, without necessarily going out of their way to prescribe any particular remix), maybe something like PhotoSynth where you crawl the web for media having similar GPS and timestamps could work. Maybe people could be bothered to tag their posts with hashtag #YetAnotherCon2017; then you just have to monitor a couple of the more popular social channels.
The bigger trick would be getting various parties at any given event to help out by first recording and then submitting their data to the same collaboration service. I've seen enough rooms full of techies struggling to get a projector or conference call working to imagine all kinds of headaches with connectivity, app installation, finding the right event reference, etc. If you allow post-event submission, most people would probably forget or not care by the time they got back to their home networks only to be annoyed weeks or months later that they still have a large audio file taking up space on their device.
As more people are posting various captures (just for personal-reasons/vanity, without necessarily going out of their way to prescribe any particular remix), maybe something like PhotoSynth where you crawl the web for media having similar GPS and timestamps could work. Maybe people could be bothered to tag their posts with hashtag #YetAnotherCon2017; then you just have to monitor a couple of the more popular social channels.