A system that enables a group to collaborate to capture and share media for an event. An organizer defines the time and location of an event, which establishes a geofence around the event area. Each event participant uses a mobile application that coordinates communication and sharing. The participants' devices form a mesh network with peer-to-peer links, for example over Bluetooth or Wi-Fi. Media, such as photos or videos, captured by a participant are shared over the mesh network. To accommodate low bandwidth peer-to-peer links, reduced-size media, such as thumbnails, may be shared. Participants may exchange messages and update peers on their locations. Locations may be determined using GPS, or by correlating camera images and 3D sensor data with a model of the event area. Media may be uploaded to a server and curated to form integrated media records of the event, such as a highlight reel or news feed.