Families are needed to host high school students from 30 countries in Latin America, Europe and Asia who are scheduled to arrive here in late August for the Open Door Student Exchange. The students, ages 15 to 18, will attend local high schools while living with host families. The students speak English and have spending money and medical insurance.

Participating families with high-school-age children are automatically eligible for partial scholarship subsidies for Open Door programs abroad for American students. Families interested in the program should contact Bev Mulherin, the area representative, at 777-7526.

Open Door is a nonprofit educational exchange organization founded in 1963.

Two versions of summer adventure for 10- to 14-year-old children: Alexandria offers a five-day Adventure-a-Day Camp, and Vienna is sponsoring a Youth Summer Theater Workshop.

Whitewater rafting, basic survival, sailing, a river cruise and tour of Mount Vernon, and day trips to the Cameron Run Wave Pool and Busch Gardens are offered Aug. 17 to 21 for participants in the Adventure-a-Day Camp, sponsored by the Alexandria Recreation Class Program. The $125 fee includes all admissions fees and transportation from and to the bus pickups at T.C. Williams High School, 3330 King St., and the Durant Center, 1605 Cameron St. To register, send a check or money order payable to the City of Alexandria to the Recreation Class Program, Durant Center, 1605 Cameron St., Alexandria, Va. 22314. For information, call 838-4831 or 838-4834.

Acting, writing, set designing and building, singing and dancing are some of the aspects of the theater to be introduced to participants in the Youth Summer Workshop sponsored by the Vienna Parks and Recreation Department. The program is scheduled for July 20 through Aug. 7, from 6 to 9 p.m. Monday through Friday at the Vienna Community Center, 120 Cherry St. SE. The workshop will culminate in the production of a short play written using student ideas. The registration fee is $150, which includes a daily snack and a T-shirt. To register, or for more information, call Vienna Parks and Recreation Department at 938-8000.

Are you finding mail with mid-May postmarks mixed in with current bills? Does your study or office get smaller each time you check your mail? Is your memory getting shorter with each new piece of information? Do you remember what a weekend is? The Women's Center of Northern Virginia offers a workshop to help those with information overload. Sue McMillin, author of "The Organized Woman" and "With Time to Spare," will show slides and give advice on the art of organizing space, paperwork, time and thinking at a workshop from 10 a.m. to noon Saturday at the Women's Center, 133 Park St. NE, Vienna. For information, call 281-2657. --