This week is a major milestone for Lamesa and O’Donnell high school seniors.In three separate graduation ceremonies on two evenings, over 100 seniors will step into their futures as they walk out of high school with their diplomas.The first this week to make that next step are eight Lamesa Success Academy seniors when they obtain their diplomas in an 8 p.m., Thursday ceremony in the high school gym.Lamesa High School (LHS) seniors will walk out to an 8 p.m. Friday ceremony at the Golden Tors football stadium.LHS’ graduation will begin with the Golden Tor Band playing “ Pomp and Circumstance”