Gloucester High School will hold commencement for the Class of 2011 at 10 a.m. Saturday at William and Mary Hall in Williamsburg. During the ceremonies, 478 graduates are expected to receive diplomas. Jessica Edington, left, is the 2011 valedictorian and will address the commencement, along with salutatorian Morgan Sadler, right. Edington will graduate with a 4.55 grade point average and plans to attend the College of William and Mary. She is the daughter of Mark and Danielle Edington. Sadler will graduate with a 4.51 GPA and plans to attend James Madison University. She is the daughter of Brian and Maria Sadler.