This is the last weekend of Black History Month, and you can see it off right with "Enter Frederick Douglass" at the National Portrait Gallery. Emmy Award-winning actor William Marshall will portray the black statesman in a one-man show at 7:30 p.m. Friday and Saturday. Admission is $10, $5 for students with ID. The National Portrait Gallery is at Eighth and F streets NW. If you're taking Metrorail, exit from the Red Line at the Gallery Place station. 357-3030.

Looking for something to take home with you? Stop by for the last day of the Black Memorabilia Show and Sale on Friday. Knickknacks and artifacts from most black cultures will be on sale, and experts will lecture on black memorabilia at 10:30 a.m. Hours are 10 to 8. It's at the Hubert Humphrey Building, 200 Independence Avenue SW. If you're taking Metrorail, exit from the Blue or Orange lines at the Federal Center station. 245-1904; free.

They'll celebrate the big month in Rockville this Saturday with an arts festival at the Fine Arts Arena of Montgomery College. Musical performers include the St. Augustine Gospel Choir, the Keter Betts Trio and other jazz artists. There'll be poetry readings and an art show. Hours are 7 to 9:30 p.m. Saturday. Admission is $2.50, $1 for those over 62 and under 18. 933-9767 for directions.