Class valedictorian Yuran Choi, 18, right, shares the platform with U.S. Sen. Susan Collins, R-Maine, during the graduation ceremony Sunday afternoon at Maine Central Institute in Pittsfield. Collins was the commencement speaker, while Choi delivered the valedictory speech. Rich Abrahamson/Morning Sentinel

Maine Central Institute graduates during the processional Sunday afternoon at the school’s commencement exercises in Pittsfield. Rich Abrahamson/Morning Sentinel

Maine Central Institute graduates during the processional Sunday afternoon at the school’s commencement exercises in Pittsfield. Rich Abrahamson/Morning Sentinel

Graduates of Maine Central Institute gather Sunday afternoon before the start of commencement exercises in Pittsfield. Rich Abrahamson/Morning Sentinel

Senior Liam Burgess is pinned Sunday afternoon before the graduation ceremony at Monmouth Academy. Andy Molloy/Kennebec Journal

Olivia Degen, left, a junior, and Sophia Johnson, a sophomore, prepare to serve as ushers Sunday afternoon before the graduation ceremony at Monmouth Academy. Andy Molloy/Kennebec Journal