IN last Sunday's food section, the address and phone number for the International Festival sponsored by the Washington International School were listed incorrectly. The fair will be held on the grounds of the Tregaron Estate, 3100 Macomb St. NW. Phone 364-1800.

IT began with the meat-sauce casserole that I served on New Year's Day to finish off I six hours of TV Bowl watching, and ended at my daughter's school auction. The casserole was so well received by family and guests that they left an assortment of interesting designs on my eight white placemats.

Cleaning up the next morning, I wiped one mat. Nothing happened. The meat sauce neither disappeared, lightened, nor moved. It had set. Warm water wouldn't take it off. Nor scouring powder, steel wool, Clorox, Windex, Mr. Clean, Pine-Sol, ammonia. Nothing.

"I guess I'll throw them out," I said.

"Don't be silly," said my daughter, "just frame them and give them to my school for the annual fund-raising auction."

Well, I did. I can't tell you they looked good, but I was never much for the visual arts. I can tell you they all sold--not for much, but nevertheless sold--all eight of them.

As we left the school gym after the auction, one of the buyers came up. Holding his mat at arm's length, he said to my husband, daughter and me, "You know, it's really very interesting. It could almost be a Motherwell."

"It is not a Motherwell," said my daughter. "Can't you see it's a Mother?"

This is the season for school fairs, when last year's paperbacks become next summer's vacation reading and junk finds a new moment of glory. It is also the time when home cooking is paraded publicly in bake sales and international food stands. Whether you are in the market for meat-sauce art or Saturday lunch, here are a few of the school festivals in the works for this season. Check neighborhood telephone poles, supermarket bulletin boards and store-window posters for a more complete survey of your neighborhood's possibilities.

When & Where

APRIL 23 "International Festival." Oriental, East Asian, Middle Eastern, European, Dutch, Scandinavian French, and Indian foods, along with baked goods, will be sold at the Washington International School, on the Tregaron Estate grounds, 7425 MacArthur Blvd., Cabin John, 10 a.m. to 5 p.m. 966-8510.

APRIL 30 "Annual Fiesta." A Spanish food feast is cooked by the students and families from the James F. Oyster Bilingual Elementary School at 29th and Calvert streets NW. The meal, a soccer match, and a pie throw will take place from noon until 5 p.m. 673-7271.

APRIL 30 "Spring Fest." Visitors can dine at the European Cafe, survey work by local artists, and purchase baked goods. Other menu choices include homemade soups, breads and quiches from the kitchen of the Washington Waldorf School, 4800 Sangamore Rd., Bethesda, 10 a.m. to 3:30 p.m. 673-7271.

MAY 6 "Annual Fun Fair." An International Food Booth emphasizes pastries and Spanish fare. In addition to the hoagies, meatball sandwiches, hamburgers, snow cones and other concessions, there will be a flea market, craft, and book sale at the Stoddert Elementary School, 39th and Calvert streets, NW, 3 p.m. to 8 p.m. 282-0143.

MAY 7 "May Fair/Auction." Desserts are the featured delicacies of the International Cafe, along with entrees cooked in the kitchen of Sandy Spring Friends School, 16923 Norwood Rd., Sandy Spring, Md. Demonstrations of spinning, weaving and art work done by students from 11 a.m., to 5 p.m. 774-7455.

MAY 14 "Medieval Festival." Hard sauces, meats and puddings of the age are the attractions at Barrie Day School, 13500 Layhill Rd., Silver Spring. 871-6200.

MAY 14 "Spring Fair." Sausage, sauerkraut, noodles, strudel, meatball sandwiches, tacos, chili, stuffed grape leaves, egg rolls, quiche, mousse and even cotton candy, hot dogs, sodas and watermelons will be sold at Lafayette School's 10-acre grounds, Northampton Street and Broad Branch Road NW, 11 a.m. to 3 p.m. 282-0116. MAY 14 "The Texas Bonanza." Barbequed chicken, baked beans and cole slaw at Mann School, 44th and Newark streets NW, 3 to 7 p.m. Rain date for the event, which includes bluegrass and country music, is May 15. 282-0126.

MAY 14 "Maret Fete Champetre." Choose either formality--waiter service for salads, cheeses, breads and homemade pastries at the French Cafe--or informal buffet of international offerings to include African, Middle Eastern, South American, Oriental, Tex-Mex, Italian and homemade American dishes. Maret School, 3000 Cathedral Ave. NW, 11 a.m. to 4 p.m. 483-5710.

MAY 15 "International Festival of Ward 6." Costumes and food from Africa, Ghana, Egypt, Haiti, Sierra Leone, Liberia, the Philippines, Mexico, Australia, China, France, Jamaica, Panama and the USA at Hine Junior High School, 8th Street and Pennsylvania Avenue SE, noon to 6 p.m. Rain date: May 22. 724-4772.

MAY 20 "Fun Fair." Hot dogs and similar foods will satisfy appetites of kids who get hungry from competing in games on the grounds of Hyde School, 3219 O St. NW. Rain or shine, 3 to 6:30 p.m. 282-0170.

MAY 21 "Spring Fair." The international cafe will feature food from the Middle East, Latin America, France, Italy, the Orient and Mexico. These dishes, topped off with sweets from the fancy dessert table, will be available at Murch Elementary School, 36th and Davenport streets NW, 11 a.m. to 3 p.m. 282-0130.

MAY 21 "Spring Carnival." Baked goods and ethnic dishes, rummage, arts, crafts and plant sales, at Shepherd Elementary School, 14th Street and Kalmia Road NW, noon to 5 p.m. 576-6140.

JUNE 4 "Family Night." Quiche, egg rolls and beef barbeque are the chief dishes at Francis Scott Key Elementary School, Dana Place NW, 3 to 7 p.m. 282-0113.

JUNE 4 "Annual Spring Festival." Ethnic foods, rides, games and a ceramic figures craft sale, Takoma School, Dahlia Street and Piney Branch Road NW, 10 a.m. to 4 p.m. 576-6127.