A member of the honor guard inspects the wreath at the Pentagon in 2011, on the 10th anniversary of the Sept. 11 attacks. (Bill O'Leary/The Washington Post)

“Tribute to Our Service Men and Women” — This memorial event is billed as a tribute to those who lost their lives on Sept. 11, 2001, as well as past and present members of the military. It will be held on Monday, from 6:30 to 9 p.m., at the Prince George’s Plaza Community Center, 6600 Adelphi Road in Hyattsville. For more information, call 201-864-1611.

Prayer services at Washington National Cathedral — In lieu of a large commemoration event, the cathedral will mark the anniversary with regularly scheduled services on Tuesday. Worship services include a morning prayer at 8:45 a.m., a noon service, and a choral service at 5:30 p.m.

View Photo Gallery: A look back at the Sept. 11, 2001, attacks on the United States.

Sept. 11 remembrance ceremony — The city of Leesburg will hold a remembrance ceremony on Tuesday at 6:30 p.m. on the Town Green, located at 25 W. Market Street. Additionally, the Freedom Memorial at Freedom Park, 101 Colonel Grenata Circle, will be open from 7:30 a.m. to 9 p.m. For more information, call 703-777-1368.

National Day of Service and Remembrance — Hundreds of volunteers are expected to turn out for a day of service in downtown D.C. Tuesday. The event, hosted by Serve DC, will includes food truck vendors, a community outreach fair, mini service projects, emergency preparedness demos, local artists and musicians, and remarks by community, local and federal leaders. It will be held on Tuesday from 11:30 a.m. to 2 p.m. at Freedom Plaza, Pennsylvania Avenue between 13th and 14th streets NW.

9/11 Patriot Day events — The U.S. Navy Memorial Foundation will hold a series of commemorative events Tuesday afternoon. A wreath-laying ceremony will be held at 4 p.m., followed at 4:30 p.m. by a photo exhibition and reception for the USS New York. At 6 p.m., there will be a book release for “In the Shadow of Greatness.” The events will be held at the National Heritage Center, 701 Pennsylvania Ave. NW. Attendees are asked to wear summer white or business casual attire.

Moment of silence at Arlington National Cemetery — Arlington National Ceremony will hold a moment of silence at 9:37 a.m. Tuesday to remember the 184 victims of the attack at the Pentagon. The cemetery will be open to the public.

“Still Standing—Still Free” — This photography exhibition at the Women in Military Service for America Memorial showcases 40 images taken at the Pentagon on 9/11. Some of the photos are being exhibited to the public for the first time. The exhibition includes the work of D.C. area photographers Sean Kelley, Joe Pisciotta, Stephen Jaffe and Bob Pugh.

Private ceremony at the Pentagon Memorial — Public access to the Pentagon Memorial will be limited Tuesday morning due to a private ceremony and visitation of the site by survivors and surviving family members. The memorial will be closed to the public from 5 a.m. to 12 p.m.

Blood drives — People wishing to make blood donations on Tuesday can contact the Red Cross at 1-800-733-2767 or make an appointment online.

Tell us: How will you observe Sept. 11 this year? Share your thoughts and additional events in the comments below.

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View Photo Gallery: The nation gathers Tuesday to mark the 11th anniversary of the Sept. 11, 2001, terror attacks.