It is touted that mega-event host cities can strategically use the skills, knowledge, and networks developed from hosting as a catalyst to bid for and host subsequent events. There is currently scant research to support this claim. This study set out to develop and refine a set of indicators that can be used to assess an event hosting legacy. Based on the concepts of "eventful cities" and "event portfolios," a review of secondary data sources was conducted to compile a list of draft indicators that could evaluate an event hosting legacy in respect of assessing the skills, knowledge, and networks required to host future events. These measures were refined by an expert Delphi panel over three rounds to arrive at a final set of 12 indicators. An agenda for future research to confirm the reliability and validity of these indicators is discussed.