The Zeta Chi Omega Chapter of the Alpha Kappa Alpha Sorority will host its 27th Annual Luncheon/Fashion Show from 12:30 to 4:30 p.m. Sunday at the Crystal City Hyatt Regency Hotel, Arlington. Tickets are $25 per person. All proceeds will go toward the Cooley-Moore Scholarship Fund, which will award college scholarships to six Northern Virginia minority high school students.

Call Julia Pryor at 683-4021 to register for the show, or write for tickets to 806 S. George Mason Dr., Arlington, Va. 22204. Alexandria's George Washington High School will continue its 50th Anniversary Celebration with a Back-to-School Night on Nov. 21 at 7:30 p.m. in the school auditorium at 1005 Mount Vernon Ave.

All former and current students, families, friends and staff members are invited to tour the high school. For further information, call 549-1390. Another George Washington 50th anniversary event will be the Reunion Dinner of the annual Old Oaken Bucket Thanksgiving Day football game between George Washington High School and Arlington's Washington-Lee High School. The dinner, open to anyone who participated in the game, will be held Nov. 29 at the Twin Bridges Marriott Motor Hotel.

Tickets are $25 per person and reservations will not be accepted after Nov. 15. Tables of 10 may also be reserved for $250 per table. Write for reservations to the Old Oaken Bucket Reunion Committee, P.O. Box 10470, Alexandria, Va. 22310-0470. For more information, call dinner chairman Eddie Crane after 5 p.m. at 971-7405. The St. Stephen's Episcopal Day School For Boys will present an evening of casino games, hors d'oeuvres, an exotic Thai dinner and a silent auction of hundreds of prizes at their "Evening in Bangkok" Saturday at 6:30 p.m. Prizes to be auctioned include lunches with prominent Washingtonians, hotel weekends, gourmet baskets, hand-made clothes, professional services from doctors, lawyers, teachers and real estate agents, and a puppy. The live auction will feature a bright red '86 Chevrolet Cavalier, as well as holiday trips to England, Jamaica and Switzerland.

Reservations should be made through the school at 1000 St. Stephens Rd., Alexandria, 751-2700. Tickets will also be available at the door.

*A workshop on "Financial Aid for College" will be held at the Arlington County Central Library Nov. 14 at 7:30 p.m. College aid specialists Herm Davis and John Cantalupo will discuss the various types of assistance available, with an emphasis on funding options for middle-income families.

The program is free and open to the public. The library is located at 1015 N. Quincy St., Arlington. For more information, call 527-4777.

*Saturday will be the final day of the Falls Church Farmer's Market on the Park Avenue side of City Hall. Fresh fruits and vegetables are available from 8 a.m. to noon at the market, which is sponsored by the Falls Church Recreation and Parks Department.

*The Cherrydale United Methodist Church at 3701 Lorcom La., will have an all-you-can-eat spaghetti dinner Nov. 16 from 4:30 to 7 p.m. Adult tickets are $4.50 and children's (12 and under) tickets are $2. Tickets at the door are $1 more, and a bake sale will be held simultaneously for those diners with incorrigible sweet tooths. For reservations, call 527-2621.

*The YWCA Women's Network will hold its monthly meeting Tuesday at the Fairfax County YWCA. The program will feature "Career Transitions," with a panel of three women speaking about their personal and professional experience in making dramatic career changes.

The meeting will begin at 6 p.m. with refreshments and will be followed with a business meeting. The YWCA is at the intersection of Wolftrap and Gallows roads, one mile south of Tysons Corner. Admission is $5 for Network members and $7 for nonmembers. Call 560-1111 to register.

*The Hospice of Northern Virginia will offer its Patient Care Training Program in Prince William County beginning Tuesday. The program will be taught at Woodbine Baptist Church, Independent Hill, and is open to volunteers who want to assist families in caring for their terminally ill loved ones at home. For more information or to register, call Adele Jenney at (703)525-7979.