To commemorate Martin Luther King Jr.'s birthday (January 15), the National Theater will present an afternoon of song, dance and magic this Saturday. Debra Tidwell, the Shiloh Gospel Choir and the Cohan Octette are among the musical performers. The dancers include Malcolm- Jamal Warner of the "Bill Cosby Show," Bebe Gribble and the Chinese Butterfly Dancers. If you're looking for magic, Hal Diamond will make with the hocus-pocus, and there'll be some break dancers and unicyclists to round out the entertainment. D.C. Delegate Walter Fauntroy will read King's " Have a Dream" speech to highlight the day. The commemoration show starts at 2 on Saturday. The National Theater is at 1321 Pennsylvania Avenue NW. If you're taking Metrorail, exit at the Metro Center station. 783-3372; free.

The American History museum will also celebrate Dr. King's birthday with "Of Songs, Peace and Struggle." Starting at 1 on Saturday, James Orange, a civil rights activist who worked on the Selma-to- Montgomery march, will give a 45-minute lecture on King and the struggle in Birmingham. From 1:45 until 4 there'll be a civil rights song workshop with Carlton Reese, director of the Alabama Christian Movement Choir, and a local ensemble. The museum is at 14th and Constitution Avenue NW. If you're taking Metrorail, exit from the Blue or Orange lines at the Federal Triangle station. 357-2700; free.