8:46 a.m.-10:38 a.m. Shadow of Baltimore's World Trade Center traverses Maryland's 9/11 Memorial at the Inner Harbor. No speakers are planned, but the public is invited to watch the tower serve as a sundial marking the events of 9/11 on the memorial.
11 a.m.-9 p.m. Mission BBQ in Anne Arundel County will provide a free sandwich for all local emergency and first responders. At noon, Baltimore paramedic Tina Stoltz will sing the national anthem. Harundale Shopping Center, 7748 Ritchie Highway in Glen Burnie.
4 p.m.-6 p.m. The public may join Harford County volunteer firefighters and community groups in a flag-waving tribute on the Route 152 overpass at Interstate 95. There is free parking at the Route 152 Mountain Road Park and Ride at Exit 74.
5:45 p.m. About two dozen people, including veterans from the wars in Afghanistan and Iraq, will paddle into the Inner Harbor as a remembrance. The event is one of many "United We Paddle" activities happening across the country. The launch site is the Canton Kayak Club's dock at Tide Point, 1020 Hull St.
7 p.m. Candlelight vigil near 2,977 flags planted along each side of a quarter-mile of Putty Hill Avenue in Parkville. The public is invited to gather in the parking lot of the shopping center at 2531 Putty Hill Ave.
7:30 p.m. 9/11 Memorial Concert by members of the Towson University music faculty, who will play works by Gerald Bales, Robert Muczynski and others. The concert is at 8000 York Road in Towson; tickets cost $5-$15.