1. A method of editing event categories, the method comprising: at an electronic device having a display: displaying a video monitoring user interface on the display, the video monitoring user interface including one or more recognized event categories, each event category corresponding to one or more motion events classified into the event category based on respective motion vectors of the motion events; detecting a user input selecting an event category of the one or more recognized event categories; in response to detecting the user input, displaying an editing user interface for the selected event category on the display, the editing user interface including a first region having a plurality of animated representations, wherein the plurality of animated representations correspond to a plurality of previously captured motion events assigned to the selected event category; detecting one or more subsequent user inputs selecting one or more of the plurality of animated representations included in the first region of the editing user interface; in response to detecting the one or more subsequent user inputs, causing a set of previously captured motion events corresponding to the one or more selected animated representations to be identified for disassociation from the selected event category; and causing the identified set of previously captured motion events to be disassociated such that subsequent classifications of motion events into the selected event category are based on the motion vectors of the plurality of previously captured motion events assigned to the selected event category that have not been disassociated.