Fostercare Training Session. 9 a.m.-5 p.m. Special Foster Care Program of Northern Virginia Family Service, 10455 White Granite Drive, Oakton. First of three training sessions for individuals and couples willing to provide nurture and a loving home for children and youth in need of respite or foster care. Register at 571-478-2557 or www.nvfs.org/fostercare.
Astrobiology: Friend or Foe of the Dialogue Between Science and Religion? 12:45 p.m. Fairfax Unitarian Church, 2709 Hunter Mill Road, Oakton. The study of the origin, extent, and future of life has been highlighted by Kepler’s success at detecting extra solar planets.
Assistance League of Northern Virginia. 10 a.m. Fairfax County Police Department-Sully District Station, 4900 Stonecroft Blvd. Chantilly. With Suzanne Rotolo PhD, nurse manager of the FACT Department, Inova Fairfax Hospital. 703-591-2312 or www.northernvirginia.assistanceleague.org.
Stroke and Osteoporosis Screenings. Sugarland Hill Senior Apartments, 1100 Dranesvilles Road, Herndon. Five screenings available, including cardiovascular, bone density screening, cholesterol and glucose. Packages from $149. Schedule appointments at 1-800-697-9721 or www.lifelinescreening.com.
Protect Trees: Remove English Ivy. Meet at Christ the Servant Lutheran Church, Glade Drive, Reston. Join RA environmental resource staff to help restore the natural area between Hunters Woods Plaza and Hunters Woods Condominiums. Volunteers will remove English Ivy that is threatening trees and reducing biodiversity. firstname.lastname@example.org or 703-435-7986.