Concert and Festival Curators. SPKRBX is an independent, Chicago based, concert production company. Since 2015, SPKRBX has ascended to become the premier, boutique, live entertainment firm it is today . Having produced concerts in various venues and cities, ranging from 300 to 40,000 attendees, SPKRBX is experienced in all facets of event production. Talent Buying, Marketing, Management, Design, Strategy, and Concert & Festival Operations are just some of the services that SPKRBX specializes in.