The Smithsonian will offer free showings of "The Black Stallion" to family members only (membership cards required) this Saturday and Sunday, in Carmichael Auditorium.

The oceanographic documentary "The Great Barrier Reef" has been adapted for projection on the IMAX screen. It will be shown at 6 and 8 p.m. in the Air and Space Museum's Langley Theater on March 9, 10 and 11. Ticket prices are $4 and $5.50.

Following through on the example of "Napoleon," The Barns will offer silent revivals with live orchestral accompaniment in March, when the Eastman-Dryden Orchestra plays for "Peter Pan" on the 12th and "Phantom of the Opera" on the 14th.

The Academy Award winners and contenders of 1942 will provide the theme for a five- week Smithsonian Resident Associates series that begins Tuesday, March 30, with a 7:30 p.m. showing of "Mrs. Miniver," placed in its peculiar perspective by film critic Pat Dowell. The features scheduled for subsequent weeks are "Pride of the Yankees," "Kings Row," "Random Harvest" and a double bill of "In Which We Serve" and "The Talk of the Town" (the movie poorly cribbed by Neil Simon to make the recent "Seems Like Old Times"). This series will also be held in Carmichael Auditorium. Series tickets are priced at $13 and $16.