ATTLEBORO — The melodious voices of Attleboro High School’s chorus drifted across the sports fields prior to the 149th commencement ceremony on Friday night, where both sets of bleachers were packed, with many others sitting in folding chairs or standing at the fence around the field.

The 374 graduates — many of whom had decorated their caps — entered the field shortly past 6 p.m. to cheers and applause from the spectators, smiling nervously and chatting to one another as they strode two by two to their chairs.