We propose the development of a tool based on performance indicators, which will allow monitoring and evaluating gender roles and inequalities in European high-level policy events in order to tackle the underrepresentation of women. This tool will act as a traffic light. It will indicate red when the event has a bad behavior level with respect to gender issues in participation, amber when it is correct but could be improved and green when it has a good behavior level. The event achieving a green will be considered as a best practice and could be granted as a Gender Seal. When the result is amber or red, MAGGIE will give guidelines for the improvement of its performance.