Emancipation Day

Three sites in Montgomery County will have free activities Saturday to commemorate Maryland Emancipation Day, a celebration of the day slaves were freed in the state. At 10 a.m., Alan Spears, associate director of diversity with the National Parks Conservation Association, will speak about the underground railroad at Woodlawn Manor, 16501 Norwood Rd., Sandy Spring. Afterward, there will be a 11/2-mile underground railroad hike to Sandy Spring on the Rural Legacy Trail.

The Sandy Spring Museum and African Art Gallery, 18524 Brooke Rd., will showcase documents and artifacts related to slavery from 11 a.m. to 2 p.m.

Reenactors from the 54th Massachusetts Regiment will be at the Oakley Cabin, near Brookeville at 3610 Brookeville Rd. At 2 p.m., there will be a program featuring the Promises of God Gospel Choir and author Anthony Cohen, who will speak about "New Discoveries -- the Underground Railroad in Montgomery County." For more information, call 301-563-3400 or visit www.montgomeryparksfnd.org.

Brown vs. Board

The exhibition "Brown vs. the Board of Education: Public School Integration in Montgomery" commemorates the 50th anniversary of the Supreme Court case, which led to the full integration of public schools across the country. Noon-4 p.m. Tuesday-Sunday, through March. Montgomery County Historical Society's Beall-Dawson House, 103 W. Montgomery Ave., Rockville. $3; $2, seniors and students. 301-762-1492 or www.montgomeryhistory.org.

Ailey II

Ailey II, an ensemble of the Alvin Ailey dance troupe, launches the dance series at the BlackRock Center for the Arts with two programs featuring highlights from Alvin Ailey's signature dance piece "Revelations." The piece, originally choreographed in 1960, is based on Ailey's Texas upbringing. 4 p.m. and 8 p.m. Saturday. 12901 Town Commons Dr., Germantown. $28 in advance; $30 at the door. 301-528-2260 or www.blackrockcenter.org.

Chris Jackson and Marimba Gold-Watts of Ailey II will perform Saturday. Two programs will feature highlights from Alvin Ailey's "Revelations."