Frederick:10 a.m.-5 p.m. through Jan. 6. At the National Museum of Civil War Medicine, an exhibit on 19th-century Christmas traditions with a focus on celebrations by Union and Confederate soldiers. Fee charged. 301-695-1864.
Martinsburg, W.Va.:1-4 p.m. today. Tours of the Belle Boyd House with dulcimer music Saturday and bell ringing Sunday. Free. 304-267-4713 or http:/
Front Royal, Va.:11 a.m.-3 p.m. today. At the Northern Virginia 4-H Educational and Conference Center, a Civil War Christmas program with a portrayal of Gen. Robert E. Lee by David Palmer, crafts and refreshments. Fee charged. Contact Avery Born at 540-635-7171.
Philadelphia: Noon Dec. 31. At Laurel Hill Cemetery, the General Meade Society's annual birthday celebration, with a parade of reenactors, memorial service, 21-gun salute and champagne toast. Free. 215-228-8200.
The District:9 a.m.-5 p.m. Jan. 10; reservations required by Jan. 4. At the National Archives, a public symposium on the 1808 Slave Trade Act with Allen Weinstein, archivist of the United States, and Lonnie G. Bunch, founding director of the National Museum of African American History and Culture, among others. Fee charged. Contact Katie Williams at 202-357-5127 or http:/