Sunday 6

ALCOHOLICS ANONYMOUS, 2-3 p.m., Conference Room 2/3, Potomac Hospital, 2300 Opitz Blvd., Woodbridge. 703-445-0777.

EARTH DAY FESTIVAL, featuring hikes, music, raptor and reptile programs and hands-on activities. 1-5 p.m., Leesylvania State Park, 2001 Daniel Ludwig Dr., Woodbridge. $1 parking fee. 703-792-6819.

Monday 7

HOME-BUYING SEMINAR, 7-8:30 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. Free; registration required. 703-792-6287.

LIBRARY PROGRAM, sample Native American food in celebration of National Library Week, sponsored by the Prince William Public Library System. 7 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. Free; registration required. 703-792-4800.

CROHN'S AND COLITIS SUPPORT, for patients and family members, sponsored by Potomac Hospital. 7 p.m., Potomac Center (next to the hospital), Suite 320, 2296 Opitz Blvd., Woodbridge. 703-221-2500.

PRINCE WILLIAM PURLERS KNITTING GUILD, 7-9 p.m., Baptist Outreach Hearth and Home Senior Adult Day Care Center, 8730 Sudley Rd., Manassas. 703-491-8619.

Tuesday 8

DIABETES SUPPORT, for patients and family members, sponsored by Potomac Hospital. 7 p.m., Potomac Hospital, 2300 Opitz Blvd., Woodbridge. 703-221-2500.

BULL RUN TROUBADOURS, 7:30 p.m., Trinity Episcopal Church, Battle and Church streets, Manassas. 703-753-2249.

DISABLED AMERICAN VETERANS, Eastern Prince William County, Chapter 48 and Auxiliary. 7:30 p.m., Dale City Fire Department, Dale Boulevard and Hillendale Drive, Dale City. 703-451-4554.

CELTIC ART WORKSHOP, for adults and teenagers, sponsored by the Prince William Public Library System. 7 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. Free; registration required. 703-792-4800.

LIBRARY STORY TIME, sponsored by the Prince William Public Library System. For ages 2-3, 10:30 and 11 a.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas, 703-792-4500. For preschool groups of 5 or more, 10:30 a.m., Potomac Community Library, 2201 Opitz Blvd., Woodbridge, 703-494-8126. For ages 3-7, 10:30 a.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. 703-792-4800. Free; registration required.

Wednesday 9

PARK AUTHORITY BOARD MEETING, 7 p.m., Prince William County Park Authority Headquarters, 14420 Bristow Rd., Manassas. 703-792-4296.

ALZHEIMERS SUPPORT, sponsored by the Prince William Senior Center. 7 p.m.,13850 Church Hill Dr., Woodbridge. 703-497-0741.

WRITERS GROUP, 7:30 p.m., Borders Books & Music, 2904 Prince William Pkwy., Woodbridge. 703-897-8100.

TOASTMASTERS INTERNATIONAL, Lake Ridge Club No. 8913. 7:30 p.m., Tall Oaks Community Center, 12399 Hedges Run Dr., Lake Ridge. 703-494-5530.

CAKE DECORATING WORKSHOP, sponsored by the Prince William Public Library System. 7 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. Free; registration required. 703-792-4500.

LIBRARY STORY TIME, sponsored by the Prince William Public Library System. For ages 2-3, 10:30 a.m., Potomac Community Library, 2201 Opitz Blvd., Woodbridge, 703-494-8126. For ages 3-6, 4 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas, 703-792-4500. For ages 3-8, 4 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge, 703-792-4800. Free; registration required.

PRINCE WILLIAM CHESS CLUB, 7-9 p.m., Borders Books & Music, 2904 Prince William Pkwy., Woodbridge. 703-670-5887.

Thursday 10

LIBRARY STORY TIME, sponsored by the Prince William Public Library System. For children 4-6, 10:30 a.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas, 703-792-4500. For children of all ages, 10:30 a.m., Potomac Community Library, 2201 Opitz Blvd., Woodbridge, 703-494-8126. For children 6-12, 3 p.m., Potomac Community Library, 2201 Opitz Blvd., Woodbridge, 703-494-8126. Free; registration required.

CANCER SUPPORT, for patients and family members, sponsored by Potomac Hospital. 7 p.m., Potomac Center (next to the hospital), Suite 320, 2296 Opitz Blvd., Woodbridge. 703-221-2500.

BOOK DISCUSSION GROUP, for grades 4 and higher. 4 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. Free; registration required. 703-792-4500.

MYSTERY BOOK CLUB, "This Pen for Hire," by Laura Levine. 7 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. Free; registration requested. 703-792-4500.

Friday 11

BACK DOOR FRIENDS, noon, River Woods Community Center, 16573 Nanticoke Rd., Woodbridge. 703-221-5513.

SPRING DANCE, sponsored by Parents Without Partners. 8 p.m.-midnight, Woodbridge Elk's Lodge, 14602 Minnieville Rd., Woodbridge. $8 members, $10 nonmembers. 703-441-8182.

Saturday 12

NATURE WORKSHOP, wildflower walk, sponsored by the Friends of Bull Run. 10 a.m.-noon, Bull Run Mountain House, 17405 Beverly Mill Dr., Broad Run. Members, $5; nonmembers, $10. Reservations required. 703-753-2631.

RECOVERY INC., for people experiencing anxiety, depression, fear and other emotional problems. 10 a.m.-noon, Cokesbury United Methodist Church, 14804 Blackburn Rd., Woodbridge. 703-490-5423.

LIBRARY STORY TIME, for children of all ages, sponsored by the Prince William Public Library System. 11 a.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. 703-792-4500.

INCOME TAX ASSISTANCE, provided by Volunteer Income Tax Assistance and sponsored by the Prince William Public Library System. 10 a.m.-2 p.m. Saturdays, Bull Run Regional Library, 8051 Ashton Ave., Manassas, 703-792-4500. 10 a.m.-1 p.m. Saturdays, Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge, 703-792-4800. 10 a.m.-2 p.m. Saturdays and 6-8 p.m. Tuesdays, Potomac Community Library, 2201 Opitz Blvd., Woodbridge, 703-494-8126.

BILINGUAL STORY TIME, in Spanish and English, for children of all ages, sponsored by the Prince William Public Library System. 11 a.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. Free. 703-792-4500.

Items are accepted on a space-available basis from public and nonprofit organizations only, and must be received at least 14 days before the Sunday publication date. Submit information to: This Week, The Washington Post, 9420 Battle St., Manassas, Va. 20110. Include event name, dates and times, exact address, cost and a publishable contact phone number. For more information, call 703-392-1303.