"Weekend Edition," the latest offering of news, features and analysis from National Public Radio, will make its Washington debut at 11 a.m. tomorrow on WETA-FM (90.9). The two-hour news magazine with correspondent Scott Simon will bring "a good strong information component" to the WETA Saturday schedule, says station manager Kim Hodgson.

"Though we are basically a classical station, 'All Things Considered' strengthened our weekday schedule, and we are adding this at a time when the audience is strongest," says Hodgson. He says he hopes the audience likes the "more reflective, analytical" stories he says he has heard on tapes of the show. "The kind of thing that they are doing is special. They sent Scott to Oregon to the Rajneeshpuram to take a look at why the people do the things they do. Other programs told us what they do."

WETA has moved "Playhouse 91" to Sundays at 6 p.m., says Hodgson, because the station was losing some audience at its old time of noon. This Sunday "Playhouse" is being preempted for "The Lights of Hanukkah." Other changes in the weekend schedule: On Saturdays, "A.M." is now 8 to 9 a.m. (shorter by one hour) and "Desert Island Discs" is 9 to 11 a.m.; on Sundays "Opera Etc." begins at 7 p.m. and also is one hour shorter. Also from the NPR file: The network is taking "Morning Edition" to New York Wednesday for the inauguration of the new studios of member station WNYC. New Sounds

WHFS-FM (99.1) has added "Collage," an hour of new experimental music hosted by Gerald Trudell, to its Sunday schedule at 8 p.m. Trudell says the show fills a gap between the "restrictive narrow range of pop formats which now exist in commercial radio or the mainstream . . . jazz and classical formats predominating the noncommercial radio fare." Charity News

WHUR-FM (96.3) far surpassed its Project Harvest goal, raising $18,500 and filling two trailers with food last week . . . WMZQ-FM (98.7) helped raised $40,000 for the Sunshine Foundation recently by participating in a bowlathon at local Bowl America Centers . . . WAVA-FM (105.1) recently helped the Multiple Sclerosis Foundation raise $153,243 through the Ugliest Bartender Contest . . . At the Greaseman remote last week, WWDC-FM (101.1) gathered 872 cans of food for Temporaries Food for Christmas . . . Steve Alan of WLTT-FM (94.7) will participate in the last day of the Connecticut Connection Food for Christmas drive today at noon . . . WGMS-FM (103.5) is collecting donations for Children's Hospital until Jan. 4; a $25 gift entitles the donor to a Disney doll . . . WAMU-FM (88.5) is collecting toys at the station Dec. 16-19 for the Hospital for Sick Children . . . Tom Gauger of WMAL-AM (630) will emcee "Christmas Memories," an effort by local theater companies Monday at Arena Stage at 8 p.m. The evening of readings is free but everyone is asked to donate 10 pounds of nonperishables, which will be distributed by the Capital Food Ban . . . WKYS is cosponsoring the Kashif concert Dec. 16 at 8 p.m. at the Warner Theatre. Kashif is donating his performance to the local Easter Seal Society, which will be buying toys for disabled children . . . WCLY-FM (95.5) is cosponsoring another "world's largest office party" from 4 to 9 p.m. Dec. 23 at the Hyatt Regency in Bethesda. Participants are asked to donate a toy or $2 for needy children . . . Greg Cole of WPKX-FM (105.9) will bowl for the Cystic Fibrosis Foundation at the Alexandria Bowling Center tomorrow. Specials

WETA is carrying the Advent Carol Service from St. John's College in England live at 1 p.m. tomorrow . . . WDCT-AM (1310) will have the play-by-play of T.C. Williams versus Hampton, competing for a Virginia high school football championship tomorrow at 1:10 p.m. The station also will carry the George Mason University versus Bucknell basketball game at 7:30 p.m. . . . WCLY is airing "The Billy Joel Story," narrated by the singer himself, Sunday at 7 p.m. . . . Dick Lillard is featuring the music of Washington's own "The Jewels" on WXTR-FM (104.1) at 8 p.m. Sunday. Other Fundraisers

Robert E. Lee, former chairman of the Federal Communications Commission and president of the board of the Broadcast Pioneers Library, has organized a benefit for the radio and television archives. The event will be a one-night-only performance of Richard Figge's "Clarence Darrow" at 8 p.m. Wednesday at the Hartke Theatre. Tickets are $125 . . . WDCU-FM (90.1) is conducting its second annual fundraiser through Sunday. Caviar Footnote

Jim Clark, who works for Labor's Department of Indian Employment Services, beat out his Russian challenger, Alex Kisin, an engineer, at the "caviar tastov" sponsored by WASH-FM (97.1) earlier this week. It took Clark only five minutes to devour five seven-ounce tins of caviar, which he washed down with vodka. Kisin chose Mountain Water as his chaser.