New program directors have been hired at three stations: Bob Kaghan at WBMW-FM (106.7), Tim Owens at WETA-FM (90.9) and Tom Watson at WASH-FM (97.1).

Kaghan has worked in Tampa, Fla., Charlotte, N.C., and Knoxville, Tenn., and has an impressive track record in programming contemporary-hit stations. Owens, who was one of three creators of National Public Radio's defunct "Jazz Alive," won a Peabody in 1981 for his production work on the show. He has worked as general manager and program director at a Santa Barbara, Calif., public radio station that had a variety format much like WETA's. Watson, who most recently programmed an AM station in Seattle, also has worked for a radio research firm.

At WAVA-FM (105.1) this week Program Director Smokey Rivers announced he is leaving in January to program adult contemporary KIOI-FM in San Francisco.

Market alumni notes: Marty Wall, former public relations and marketing director at WRQX-FM (107.3), has become a consultant and is advising a Denver station on its marketing effort. Decking the Halls

If you are visiting the national Christmas tree, you might wave at the crew from WAVA, which is doing remotes from the Ellipse from 3 to 6 p.m. until Christmas Eve . . . WETA will present the annual production of "The Christmas Revels" from 6:30 to 8 tonight. The narrator of the performance will be WETA's Mary Clift . . . Tomorrow at 9 a.m. Martin Goldsmith, host of "Desert Island Discs" on WETA, will discuss the season with St. Nicholas . . . On Monday from 6 to 9 p.m., WWRC-AM (980) will present a special featuring music by Bing Crosby, Perry Como and Nat (King) Cole. Christmas Eve & Christmas Day

For the fifth year, WMAL-AM (630) will present "Christmas Eve at the Kennedy Center" with Tom Gauger. From 10 a.m. to 3 p.m. Gauger is the host to a variety of local school vocal ensembles, the Fairfax Choral Arts Society and offerings from other staffers, such as "Crabs for Christmas" by John Lyon and Ed Walker . . . The staff of WDCU-FM (90.9) will be reading Christmas stories from noon to 2 p.m. on Tuesday and Christmas Day. On the 25th, the readings will be followed by holiday music from Africa and the Caribbean from 2 to 4 p.m, and holiday music from Latin America from 4 to 6 p.m. . . . WPKX-FM (105.9) is taking its country theme right to the Christmas tree as country stars sing and talk about their holidays beginning at noon Tuesday and continuing until noon Christmas Day . . . WGMS-FM (103.5) starts its festival with traditional carols at 3 p.m. Tuesday. A dramatization of Dickens' "A Christmas Carol" will follow. Then, at 10 a.m. Christmas Day, WGMS will play "The Nutcracker," and at 1 p.m. there will be a special "British Country Christmas" with Eileen Curtis. Handel's "Messiah" begins at 3 p.m. . . . WXTR-FM (104.1) is departing from its oldies format Christmas Eve to present Christmas songs for 24 hours . . . WTKS-FM (102.3) will feature 18 hours of Christmas music beginning at 6 on Christmas Eve . . . WCLY-FM (95.5) is warming up its Christmas carols to start Christmas Eve at 6 and go nonstop until 10 Christmas morning. The rest of the day it will feature Christmas music and greetings from listeners . . . WWRC will present a Bing Crosby special on Christmas Eve from 7 to 9, followed by 23 hours of holiday songs . . . WMAL will gear up its annual "Santa Call-In" on Christmas Eve from 7 to 8 p.m. That will be followed by two hours of Frank Sinatra in a holiday mood . . . WTOP-AM (1500) will carry the 37th annual "trip" to the North Pole of CBS correspondent Douglas Edwards at 7:16 p.m. Tuesday . . . John Hickman of WAMU-FM (88.5) will search through his collection of vintage radio programs to compile "Christmas Eve Recollections" from 8 until midnight Christmas Eve . . . WBMW is presenting uninterrupted Christmas music from 6 a.m. until noon on Christmas Day. Same continuous schedule at WRQX, and WHUR-FM will be playing mostly Christmas music . . . At 8 a.m. Ed Walker of WMAL will host "A Child's Christmas," with music by Gene Autry and Frostie the Snowman and Co. WMAL will end Christmas Day by playing "A Christmas Carol" at midnight . . . From 10 a.m. to noon WAMU will have a salute to Lewis Carroll and a program of Celtic music. More Giving

Marty Bartone of WPKX-AM (730) and FM will be participating in the closing ceremony of the U.S. Marine Corps Reserve Toys for Tots campaign tomorrow at 9 p.m. at Landover Mall . . . WCLY is cohosting another "world's largest office party" at the Hyatt Regency in Bethesda Monday from 4 to 9 p.m. Guests are asked to donate a toy or $2 . . . WGAY-FM (99.5) has helped sell 1,500 albums so far for the Hecht Co. Angel Project . . . And WKYS-FM's (93.9) preliminary tally for Food for Christmas stands at 136,000 cans of food, surpassing last year's final count of 76,000. Warning Season

In this season of "don't drive drunk" reminders, WKYS today is kicking off a "sober ride campaign" in conjunction with Transportation General. The sponsors are giving free rides home to revelers who need assistance and ask for it by calling 578-HOME.