An electronic device with a display and, optionally, a touch-sensitive surface obtains a collection of media items. In some embodiments, the device determines one or more patterns in the collection based on a comparison between properties of sequentially adjacent items and divides the collection into multiple events that includes a plurality of multi-item events. In some embodiments, the device receives a first request to display a first portion of the collection organized in accordance with a first detailed-granularity level and, in response to the first request, displaying a first plurality of representations of the items. The device receives a second request to display a second portion of the collection organized in accordance with a respective overview-granularity level that corresponds to multiple detailed-granularity levels and, in response to the second request, displays a second plurality of representations of the items.