1. A method of identifying occurrence of one or more organized athletic events, each of the organized athletic events having a plurality of participants, the method comprising: receiving athletic activity data for the participants from a plurality of activity monitoring devices carried by the participants, the athletic activity data defining workouts performed by the participants; defining a plurality of parameters for the athletic activity data, the parameters defining common athletic activity data for the participants of each of the organized athletic events; clustering the athletic activity data into one or more clusters of workouts based on the defined parameters for the athletic activity data; identifying the one or more organized athletic events based on the one or more clusters of workouts; and filtering the one or more organized athletic events to identify one or more relevant organized athletic events within a predetermined distance from a vendor.