Abstract: An activity-information system is provided. The system comprises an activity-information server and a plurality of activity-information devices. Activity-information devices may be proprietor devices (e.g., for bar owners/staff), affiliate devices (e.g., for club promoters or taxi drivers), or end-user devices (e.g., for patrons). The activity-information devices provide activity information (such as, a user's location or presence at a venue or within a district) to the activity-information server, which stores the activity information in an activity-information repository. The activity-information server then determines activity levels for venues and districts, which may be transmitted to devices. The activity-information device then may display activity level in an activity-information interface. The activity-information interface may comprise a map with highlighting and icons indicative of activity levels for districts and venues, respectively.