For this, the first weekend of Black History Month, Washington celebrates on canvas and in sculpture, in performances and talks all around town. Martin Luther King Memorial Library pays tribute to Frederick Douglass through "North Star," a play based on his life and writings, Saturday at 2. Admission is free, as it is for the exhibition by five black artists opening there February 7. There's free parking at 901 G Street NW (also near the Metro Center and Gallery Place Metro stops). The Crispus Attucks Museum and Park of the Arts opens officially in March. But there will b celebrations this Saturday, 10 to 1, with storytelling and dancing, sculpture and artwork from Africa and from local artists celebrating black Americ Friday at 10 and 11:30 and Saturday and Sunday at 1 and 3. Folktale performances are $2.50 ($2 for those under 13) at 900 Jefferson Drive SW (continuing through February). "Two Centuries of Black American Art" shows Friday at 10, 11 and 1:15, a 26-minute film in the Anacostia Museum. Also free is a talk for young people by artist Sam Gilliam: "Helping Young People Look at Art," Saturday at 2. At 2405 Martin Luther King Avenue SE. Call 357-2700. Saturday at noon, the Howard University Gospel Choir traces the progression of black sacred music in a free performance at the National Museum of American Art (Eighth and G streets NW). Get tickets at the information desk; seating is limited, so if you miss that, try next door, where the National Portrait Gallery conducts tours Saturday at noon. The hour-long talks are about eight black personalities portrayed in the collection at the gallery. Meet at the information desk at F Street at Eighth Street NW.