A three-time sellout, the Smithsonian Resident Associates' current series of Soviet features, "Kino!," will add a fourth set of bookings in a final attempt to satisfy an overflow subscription public. The additional dates are Sunday, October 10, for "Once 20 Years Later" and "The Marriage"; Wednesday, October 13, for "Several Interviews on Personal Matters" and "The Red Snowball Tree"; and Sunday, October 17, for "A Nest in the Wind" and "The Steppe." All screenings will take place at 7:30 in Carmichael Auditorium, National Museum of American History. Series tickets are $10 for Smithsonian members and $13 for non-members. For further information, call 357-3030. "Kino!" enthusiasts should also be pleased to learn that a second consignment of recent Soviet films is scheduled for a special engagement at the Key later this fall, probably in November. Seven titles will play in repertory over a two-week period.

One of the more promising American releases of the fall, the comedy "My Favorite Year," has advertised previews this Friday at a dozen area theaters. Regular commercial engagements are to begin next Friday, already notable for another new arrival, "Tex." It now appears that the vintage French gangster thriller, Jean-Pierre Melville's "Bob le Flambeur," will also turn up on October 8 at the K-B Janus. Made in 1955, the film was recently resurrected by Triumph, the new Columbia subsidiary that made a triumphant debut as an importer by picking up "Das Boot" early this year. The first congested opening day of the fall schedule, October 8 will also bring Les Blank's "Burden of Dreams" to the Inner Circle, Carlos Diegues' "Xica" to the Key and Hal Ashby's "Looking To Get Out" to area theaters.

The Wolf Trap Foundation begins the first of 18 film programs grouped into half a dozen miniature series between October and April with a showing of Ingmar Bergman's "The Seventh Seal" at The Barns on Tuesday at 8. The October series is devoted to Bergman and continues with "The Magician" and "Wild Strawberries" on subsequent Tuesdays. The spotlight shifts to the incomparable Preston Sturges in November -- "Christmas in July," "The Lady Eve" and "Sullivan's Travels" will be shown on the first three Tuesdays of the month. Later monthly programs will focus on the French, the Canadians, the Germans and Luis Bu?nuel. Individual tickets are $3 and a series subscription, $18. For information, call (703) 938-2404.

John Simmons and Sheldon Tromberg resume popular-film education courses in the week ahead. Simmons will offer two sections in film and television production and a single section in film and television financing beginning Wednesday at Media Seminars International, 1922 I Street NW. For information about curricula and registration, contact the instructor at 534-8487. Tromberg is once again offering private tutorial sessions for aspiring or struggling amateur screenwriters eager to unfold or unblock pretexts for feature dramatic films. Call 244-1818 to get acquainted.

AFI programer Mike Clark brings "Glen or Glenda?," perhaps the strangest production of the late, inimitable Edward D. Wood, to Washington for the first time on October 7 and 9, paired with the nostalgic documentary "hungry i Reunion."