The city of Roswell will hold its annual 9/11 commemoration on the back lawn of City Hall, 38 Hill St., at 8:30 a.m. Sept. 11, marking 25 years since the terror attacks that killed 2,977 people. The ceremony includes a moment of silence, a color guard presentation and remarks from Mayor Mary Robichaux and city officials. The event is free and open to the public.