1. A method for determining characteristics of an audience at a concert, the method comprising steps of: receiving, at a computer system, location information about a plurality of active mobile phones, the location information comprising at least one identifier of a geographical location and a time period; receiving, by the computer system, sentiment information relating to the audience, the sentiment information comprising at least one identifier of the concert; and determining, by the computer system, at least one characteristic about the audience based at least in part on the location information and the sentiment information.