By Emma Healy, Globe Correspondent As a freshman in 2018, Sofia D’Agostino made waves on the lacrosse field at Chelmsford High, earning a starting varsity spot and a Merrimack Valley Conference All-Star selection. But as good as she is on the field, her teammates might argue that she is perhaps even better…

By Amy Sokolow, asokolow@lowellsun.com In a normal year, Chelmsford High School’s two a cappella groups rehearse hours a week preparing a 12-minute choreographed set for the Varsity Vocals International Championship of High School A Cappella (ICHSA), an annual a cappella competition. This year, with just one hour of rehearsals a…