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Home About Join Donate News Events RMHS Today Where Are They Now. Contact Us More The Official Website of the RIO MESAALUMNI ASSOCIATION WHO WE ARE The Rio Mesa Alumni Association RMAA is a Nonprofit Public Benefit Corporation created in 2010 for the benefit of the graduates faculty and current students of Rio Mesa High School. The RMAA is the OFFICIAL alumni organization for Rio Mesa High School. LATEST NEWS EVENTS Homecoming 2018 After Game Alumni GetTogether.