Saturday 26

ARLINGTON BLOOD DRIVE, sponsored by Inova Blood Donor Services. 10 a.m. to 2:30 p.m., Arlington Central Library auditorium, 1015 N. Quincy St., Arlington. Free. For appointments, call 703-698-3885 or 866-256-6372.

Sunday 27

INOVA BLOOD DRIVE, sponsored by Inova Blood Donor Services. 10 a.m. to 3 p.m., Starbucks, 2441 Harrison St., Arlington. Free. For appointments, call 703-698-3885 or 866-256-6372.

Monday 28

ALEXANDRIA BLOOD DRIVE, sponsored by Inova Blood Donor Services. Noon to 8 p.m. Mondays and Wednesdays; 8 a.m. to 4 p.m. Tuesdays, Thursdays and Fridays; Inova Alexandria Hospital, 4320 Seminary Rd. Free; registration required. 703-504-3500.

OBSESSIVE-COMPULSIVE DISORDER, support group for people with the condition. 7:30 to 9:30 p.m. Mondays, St. Andrew's Episcopal Church, 4000 Lorcom Lane, Arlington. Free. 703-250-1126.

Wednesday 30

SENIOR WALKING CLUB, a walk along the Capital Crescent Trail to Georgetown. Meet at 9:30 a.m. at Culpepper Garden Senior Center, 4435 N. Pershing Dr., Arlington. $3. 703-228-4403.

-- Compiled by RIA MANGLAPUS

To Submit an Item

E-mail: alexextra@washpost.com

Fax: 703-518-3001

Mail: Health Calendar, The Washington Post, Alexandria-Arlington Extra, 526 King St., Suite 515, Alexandria, Va. 22314

Details: Notices are accepted on a space-available basis from public and nonprofit organizations only and must be received at least 14 days before the Thursday publication date.