Harrison High School All Year Reunion and Its History. In February 2009, alumni from Harrison High School in Colorado Springs, Colorado formed a HHS All Year Reunion Committee. The goal was to host the school’s first ever, All ‘Class’ Reunion, highlighting classmates, teachers and staff from the late 1950’s up through the present year. That first reunion was a success. The committee had planned for at least 300, hoped for 500 and was pleased when over 1000 of their old HHS friends came through those doors.