Montgomery County

COUNTY COUNCIL, Tuesday, 9:30 a.m., County Office Building, council hearing room, 100 Maryland Ave., Rockville.

PLANNING BOARD, today, 9:30 a.m., auditorium, 8787 Georgia Ave., Silver Spring. Prince George's County

COUNTY COUNCIL, Tuesday, 10 a.m., legislative session, County Administration Building, Upper Marlboro.

PLANNING BOARD, today, 9 a.m., regular meeting, first floor and Wednesday, 7:30 p.m., joint meeting with the historic sites and districts plan citizens advisory committee, fourth floor, County Administration Building, Upper Marlboro.

SCHOOL BOARD, today, 6:30 p.m., Supporting Services Building (behind the old courthouse on Main Street), borad room, Upper Marlboro.

ZONING HEARINGS: Friday, 9 a.m. special exception in Bladensburg and 1 p.m., zoning case in Tuxedo; Monday, 9 a.m., zoning case in Upper Marlboro; Wednesday, 9 a.m., zoning case in Adelphi and 10 a.m., special exception in Capitol Heights. All meet in the County Administration Building, room 1040, Upper Marlboro. Charles County

COUNTY COMMISSION, Tuesday, 10 a.m. and Wednesday, 1:30 p.m., Courthouse, room 101, East Charles Street, La Plata. Rockville

MAYOR AND COUNCIL MEETINGS: Monday, 8 p.m., adoption of budget and capital improvements program for fiscal year 1981-1986, City Hall, council chambers, Maryland Avenue and Vinson Street, Rockville. Regional Meetings

WASHINGTON METROPOLITAN AREA TRANSIT AUTHORITY, today, 9:30 a.m., board room, 600 Fifth St. NW.

WASHINGTON SUBURBAN SANITARY COMMISSION, Wednesday, 1:30 p.m., 4017 Hamilton St., Hyattsville.

NATIONAL CAPITAL PLANNING COMMISSION, today, 9:30 a.m., final application for planned unit development on the 4200 block of Connecticut Avenue NW, 10th-floor board room, 1325 K St. NW.