How do organizations use the experience from projects to build a systematic capability to manage open innovation projects? Drawing upon Project Management and Open Innovation capability-building frameworks, we studied the crusade of an industrial company to create an open innovation capability. In that sense, we applied an Event Structure Analysis (ESA) to evaluate the event network, which evidenced a four-stage process: closed mode, open driver, vanguard project, project-to-organization. Results demonstrate, from causal connections, that the referred capability can be leveraged from the execution of key projects, especially from a vanguard project. Our study contributes to Project Management theory by reveling that previous experiences in both project and organizational levels offer a fertile ground for the emergence of a vanguard project. For the open innovation field, this paper provides a project-oriented approach to the discussion of open innovation?s adoption in mature firms.