Playing Out the String

March is the time to, well, go fly a kite. And The 20th Annual Smithsonian Kite Festival provides a perfect opportunity this Saturday (the raindate is Sunday). Kites must be hand- made and able to rise at least 100 feet for at least one minute. Judges will award prizes in separate categories according to design, craftsmanship, beauty, take-off, steadiness, angle and recovery. Winners will receive trophies or ribbons. The festival is at the west side of the Washington Monument. Registration and competition begin at 10; you can register until noon. 357-3030.

Getting to the Point

Take aim at The Seventh Annual Lucky Lights Washington, D.C. Open Dart Tournament at the Marriott Twin Bridges Hotel, U.S. 1 and I-395, across from the Pentagon. Anyone who's got a smattering of skill can show up to playa round or two. The best time for beginners to try their hand is Friday evening at 8 in the draw doubles matches, where you're paired at random. But if you just want to watch, there'll be plenty of pros going after $20,000 split among 10 categories, including open singles and mixed triples. The winners of the ladies' and men's open singles receive an all- expenses-paid trip to the $50,000 finals in Atlantic City this December. Entry fees range from $8 to $50; spectating is free. The event is Friday, 8:30 to 1; Saturday, 11 to midnight; Sunday, 11 to 6. 946-3037 or 628-4200.

Swivel Hips

You can line up your toes at the TAC Eastern Regional Race Walk Championships and 5K Fitness Walk this weekend. On Saturday, experts will be on hand at a free fitness walking clinic beginning at 8:15 a.m. at the reflecting pool at the foot of the Lincoln Memorial. At the clinic you can learn about race walking techniques and how to chart your own fitness walking program. A free 5K fun walk follows at 10.

But if you're the competitive type, there're all levels of races for men and women. There are 5K races on Saturday, with registration from 7:15 to 8:10 a.m.; on Sunday there'll be a women's 10K and men's 20K, with registration from 8:15 to 8:50 a.m. Cost to race is $10 per day or $15 if you want to race both days. Proceeds go to the District of Columbia Lung Association. Of course, if you'd rather just watch, you can see former Olympic and current world-class race walkers leading the pack at around an 8-minute-per-mile clip. For more information, ask for Joe Barrow at 337-7600.

Last Chance Concert

This is the last weekend for the free Guest Artist Series sponsored by the United States Air Force Band. And what a dandy it is. Country singer Lee Greenwood, recently added to the bill, flies in from Nashville to appear this Sunday at 3 at Constitution Hall. He'll join the band in singing a medley of country tunes, including his hit "God Bless the U.S.A," chosen as the 1985 song of the year by the Country Music Association. Nine-year-old Danny Cooksey, who plays Gary Coleman's step-brother Sam McKinney on the television show "Diff'rent Strokes," will also be featured in the concert. DAR Constitution Hall is at 18th and D streets NW. Free. 767-5658.

Magic Fingers

Andres Segovia, the man who made the guitar a true classical instrument, turned 93 recently. But that doesn't keep him off the stage. The Spanish legend makes a Washington appearance Saturday at 5 in the Kennedy Center Concert Hall. The program includes selections from Handel, Tchaikovsky, Torroba and Ponce. Tickets range from $5 to $25 and are available at the Kennedy Center Box Office or by calling 857-0900 or 432-0200. For more information, call the Washington Performing Arts Society at 393-3600.

Sneak Preview

If you want to catch performances of the 1986 American College Theater Festival at the Kennedy Center, you should queue up for free tickets this Saturday at 11 a.m. sharp in the Grand Foyer of the Kennedy Center. The festival, which runs from March 31 through April 12, features the final six plays chosen from a nationwide field of around 600. Tickets are limited to two per person per performance. 254-3600.

Rest of the Best

IN TOWN Sisters and violinists Ani and Ida Kavafian appear together in a duo recital for the first time in Washington Friday at 7:30 in the Kennedy Center's Terrace Theater. Tickets are $13.50 and available at the Concert Hall Box Office or by calling 857-0900 . . . Celebrate Bach's Birthday Bash with the Washington Bach Consort this Friday from 6:30 to midnight. The event is in the Grand Ballroom of the J.W. Marriott Hotel, 14th Street and Pennsylvania Avenue NW. Tickets are $25 (there will be a cash bar and buffet); proceeds go to the Washington Bach Consort. 337-1202 . . . Doctor Scantlin and His Imperial Palms Orchestra supply the music at a big band dance Friday from 9 to 1. It's at the Kennedy-Warren Restaurant and Ballroom, 3133 Connecticut Avenue NW. $6.50. For reservations, call 483-2058 . . . The Source Theater gives a free performance of The Aunts, Gary Bonasorte's drama about three women and their relationships with men. The play is Saturday at 1:30 in Room A-5 of the Martin Luther King Library, 901 G Street NW. 727- 1186.

IN MARYLAND The Daniel West Dancers perform Friday at 8 in the Performing Arts Center, Montgomery College, Mannakee Street and Route 355, Rockville. Tickets are $7; $5.50 for students and seniors. 279-5301 . . . The Masterworks Chorus presents its first spring concert this Saturday at 8 with the music of Bruckner, Brahms and Stravinsky at the Bradley Hills Presbyterian Church, 6601 Bradley Boulevard, Bethesda. Tickets are $10. 593- 5919.

IN VIRGINIA The George Mason University Orchestra performs An Evening of Opera, a program of music by Bizet, Verdi, Puccini and Wagner. Tickets are $5; $4 for students and seniors. The concert is this Sunday at 8 in the university's Harris Theater, 4400 University Drive, Fairfax. 425-3900 . . . The a cappella group Melismata performs a free concert of madrigals, motets and Renaissance music Sunday at 4 in the Lyceum Auditorium, Bicentennial Center, 201 S. Washington Street, Alexandria. Seating is on a first-come basis. 838-4994.