A mobile auction and engagement system, and method of use, for conducting auctions, advertising activities, promotions, and other engagement activities during various live events. Access to the mobile auction and engagement system can be limited to users within a geographic region, such as a sport stadium. The system includes a user tool that enables a user within the permissible geographic area to bid on auction items and participate in engagement activities, such as trivia contests. The system further includes an administrative tool that allows the system to be customized for various customers, allows input about auction items and rules, and determines how advertisements are presented.