Abstract: A system and method for an event marketplace. The system comprises a first interface for communicating with a plurality of user devices; a second interface for communicating with a plurality of systems of service providers; a progressive accuracy module for at least iteratively computing a set of total cost estimations of the event based in part on an event specification and information retrieved from one or more of the plurality of systems of service providers; and a cost optimizer for providing at least an optimal set of service providers matching the event specification, wherein the optimal set of service providers is ranked by their total cost estimations, the total cost estimation is a function of at least a proposal for a respective service.