(Courtesy Photo) English High School Army JROTC Cadet Miasia Kemp (left) and Cadet Executive Officer Jorge Maldonado hold shoes signed by Boston Celtics basketball player Avery Bradley (center) during a Black History Month event at the Celtics practice facility in Waltham Feb. 28. Twenty cadets attended the event, hosted by the Celtics and the Massachusetts National Guard, where they talked and shot hoops with Avery and former Celtics players and played a Black History trivia game.