FOR THE THIRD YEAR in a row, Sidwell Friends School will be presenting a summer-long repertory film program. Beginning Saturday with Yves Robert's 1973 French comedy The Tall Blond Man With One Black Shoe (especially timely now that Tom Hanks will star in a remake later this summer), the series will run every day (except July 4) through August 11, closing with another French comedy, Jean-Charles Tacchella's Cousin, Cousine.

Highlights include: Diane Kurys' sequel to "Peppermint Soda," Cocktail Molotov (June 21-23); a '60s Film Festival that promises a filmed be-in and shorts with topics ranging from draft resistance to Zap Comix (June 24- 25); Eric Rohmer's Pauline at the Beach (July 5-7); D.A. Pennebaker's long-suppressed Bob Dylan documentary Don't Look Back (July 8-9); Giorgio Moroder's restored version of Fritz Lang's Metropolis (July 17-18); and Alan ("Choose Me") Rudolph's 1980 rock'n'roll comedy Roadie, starring Meat Loaf, Art Carney and Blondie (July 29-30).

An added feature this year is an expanded cafe featuring homemade sandwiches and desserts, open a half hour before the first show (each attraction will be shown twice). Tickets are $3 each. For a schedule and further information on the Sidwell Cinema and Cafe, 3901 Wisconsin Avenue NW, call 537-8178.

"Legends of Black Cinema," a film festival featuring black classics produced from the '20s through the '80s, can be seen at the Riverdale Plaza theater through Sunday. The Friday screenings begin at 5 with Oscar Micheaux's 1939 production Lying Lips and continue with Song of Freedom, Rufus Jones for President, Stormy Weather and Scar of Shame.

Saturday films begin at 1 with The Learning Tree, followed by Bright Road, Man and Boy, Carmen Jones, Imitation of Life and Black Orpheus.

Sunday's five films also start at 1 with the 1936 adaptation of March Connelly's play Green Pastures followed by Hallelujah, Say Amen, Somebody, Lilies of the Field and Cabin in the Sky.

Each movie is $3.50 for adults; $2 for senior citizens and children. With the exception of one twin-bill on Friday, the theater will be cleared after each movie. Proceeds benefit the Western States Black Research Center in Los Angeles. For a film schedule, call 864-2421.

Local artist Patricia Dubroof has begun a non-commission event space, presenting en marge or "on the fringe" video works, at 2108 18th Street NW. On Monday from 7 p.m. to 10, she'll offer the first of what promises to be an ongoing series. Four local artists will be on hand to introduce and discuss their experimental videos, ranging from untitled works by Matt Dibble, Michael Moser and Rebecca Crumlish to such pieces as Patrice Andrews' Bad Boys in Berlin, Virginia Quesada's "Pictures That Sing" and Daniel Klepper's "Sons and Fathers." (Quesada and Klepper will not be there in person.) Call Dubroof at 232-7685 for more information on the program.

After you've seen some video, you might head on over to D.C. Space (Seventh and E streets NW) for an evening of films by New York underground filmmaker Nick Zedd, who apparently owes more than a passing debt of gratitude to the groundbreaking, low-budget work in the '50s and '60s of the Kuchar brothers (Hold Me While I'm Naked, Sins of the Fleshapoids). Zedd's short films Bogus Man, The Wild World of Lydia Lunch and Thrust in Me will be followed by the feature Greek Maggot Bingo, a.k.a. Monster Movie. "Horror movies might be an appropriate way to describe them," writes Pierre De Veaux, programmer for the local film collective I Am Eye. "The Wall Street Journal thought one offensive," he adds with a faint touch of pride. Zedd will be in attendance at the show on Monday. Admission is either $2 or a film of your own making, which will be shown after the announced program (which sounds like a hard act to follow). Showtime is 8:30. Call De Veaux at 667-6498 for details.

The Roth Theater chain will offer movie programming for children every Thursday, Friday and Saturday mornings at 11 a.m. at nine of its houses, beginning June 20. Ten films (Annie, The Muppets Take Manhattan, My Bodyguard, Time Bandits, The Karate Kid, The Golden Seal, Grease, The Smurfs and the Magic Flute, Dragonslayer and Star Trek II) will circulate among the participating theaters through August 24. In Maryland, the theaters are the College Park, Silver Spring East, Parkway, Seven Locks, and Village Mall. The Virginia screens are the Americana, Mount Vernon, Tysons Corner and Featherstone theaters. Five dollars will buy you a punch card of ten admissions that admits children or adults and doubles as a discount card for all local Bowl America locations. The charge for an individual show is $1.50. For further information, call or visit any Roth theater, or call the main office at 587-8450.

In a related promotion, the Roth people have announced that any student who can produce an authentic report card proving that her or she has a 4.0 grade point average will win a free ticket to the new John Travolta movie Perfect. Of course, the offer is good only at Roth theaters playing the title.

Eddie Cockrell is a freelance film consultant and teacher. His "Insights on Film" is heard Mondays at 5:30 p.m. on WGMS AM & FM. 11 a.m. at nine of its houses, beginning June 20. Ten films (Annie, The Muppets Take Manhattan, My Bodyguard, Time Bandits, The Karate Kid, The Golden Seal, Grease, The Smurfs and the Magic Flute, Dragonslayer and Star Trek II) will circulate among the participating theaters through August 24. In Maryland, the theaters are the College Park, Silver Spring East, Parkway, Seven Locks, and Village Mall. The Virginia screens are the Americana, Mount Vernon, Tysons Corner and Featherstone theaters. Five dollars will buy you a punch card of ten admissions that admits children or adults and doubles as a discount card for all local Bowl America locations. The charge for an individual show is $1.50. For further information, call or visit any Roth theater, or call the main office at 587-8450.

In a related promotion, the Roth people have announced that any student who can produce an authentic report card proving that her or she has a 4.0 grade point average will win a free ticket to the new John Travolta movie Perfect. Of course, the offer is good only at Roth theaters playing the title.