Democratic mass meetings to selected delegates to district and state conventions will be hled March 22 at 17 public halls and high school auditoriums in Northern Virginia's 8th and 10th Congressional Districts.

The meetings, which are all scheduled to begin at noon, are open to registered voters who will sign pledges of support of Democratic candidates. In order to participate at the meetings, persons must be in line to register by noon. Meetings will be held in the following places: Arlington

Registration 10:30 a.m.; Kenmore Intermediate School, 200 S. Carlin Springs Rd., Arlington: 100 delegates and 50 alternates (10th Congressional District). Alexandria

Registration 10:30 a.m.; Francis Hammond High School auditorium; 4646 Seminary Rd., Alexandria; 62 delegates and 31 alternates (8th Congressional District). Loudoun

Registration 11 a.m.; J. Lupton Simpson Middle School, Rte. 621, Leesbrug; 29 delegates and 15 alternates (10th Congressional District). Prince William

Registration 11:30 a.m.; Prince William County Amory, Dumphries Road, Manassas; 61 delegates and 31 alternates (8th Congressional District). Fairfax

154 delegates and 77 alternates from the 8th Congressional District and 159 delegates and 80 alternates from the 10th Congressional District will be elected in the following districts. Registration begins at 11 a.m.

Annandale: Annandale High School, 4700 Meford Dr., Annandale; 41 delegates and 21 alternates (8th Congressional District) and 2 delegates and 1 alternate 10th Congressional District).

Centreville: James Madison High School, 2500 James Madison Dr., Vienna; 43 delegates and 21 alternates (10th Congressional District).

Dranesville: Cooper Intermediate School, 977 Balls Hill Rd., McLean; 43 delegates and 22 alternates (10th Congressional District).

Lee: Mark Twain Intermediate School, 4700 Franconia Rd., Alexandria; 32 delegates and 16 alternates (8th Congressional District).

Mason: J.E.B. Stuart High School, 3301 Peace Valley La., Falls Church; 34 delegates and 17 alternates (10th Congressional District).

Mount Vernon: Groveton High School, 6500 Quander Rd., Alexandria; 36 delegates and 18 alternates (8th Congressional District).

Providence: Whittier Intermediate School, Hillwood Avenue and Cherry Street, Falls Church; 37 delegates and 19 alternates (1oth Congressional District).

Springfield: Irving Intermediate School, 8100 Old Keene Mill Rd., Springfield; 45 delegates and 22 alternates (8th Congressional District). Fairfax City

Registration 11 a.m.; Fairfax High School, choral arts department, 3500 Old Lee Highway, Fairfax City; 12 delegates and 6 alternates (10th Congressional District). Falls Church

Registration 11 a.m.; George Mason High School, 7124 Leesburg Pike, Falls Church; 7 delegates and 4 alternates (10th Congressional District). Manassas

Registration 11 a.m.; Manassas City Hal, 9025 Center St., Manassas; 6 delegates and 3 alternates (8th Congressional Disrict). Manassas Park

Registration 11:30 a.m., Manassas Park Elementary School, 101 Tremont St., Manassas Park; 4 delegates and 2 alternates (8th Congressional District). Stafford County

Registration 11 a.m.; Stafford County Court House, main court room, Stafford; 7 delegates and 4 alternates (8th Congressional District).