A system and method for responding to changes in social traffic in a geographic area receives, via an electronic communications interface, information describing a geographic area and one or more attributes of people expected to be in the geographic area. A geofence is defined based on the information describing the geographic area, and a cohort of people expected to be in the geofence is defined based on the one or more attributes. Information from a sensor regarding an attribute of a person at a geographic location is received via an electronic communications network. Based on the attribute, a determination is made whether or not the person is a member of the cohort of people expected to be in the geofence. An alert may be triggered based at least in part on whether or not the person is a member of the cohort of people expected to be in the geofence.
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