The Lanier Trio -- pianist Cary Lewis, violinist (and National Symphony concert- master) William Steck and cellist Dorothy Lewis -- performs Friday at 7:30 at the Kennedy Center's Terrace Theater; $13.50; 254-3600 . . . The 25th Annual Bookfair of the Association of American Foreign Service Women at the State Department, 23rd Street between C and D streets NW, is this Saturday through next Saturday (excluding Tuesday and Wednesday) from 10 to 4; 223- 5796 . . . The New Dance Ensemble performs four modern dance pieces for its Washington premiere Friday and Saturday at 8:30 and Sunday at 5 at The Dance Place, 2424 18th Street N; $8, $7 for students and seniors; 462-1321 . . . Washington Pro Musica performs a concert/cabaret of Renaissance and 17th-century madrigals and drinking songs Saturdayat the Washington Ethical Society, 7750 16th Street NW. Doors open at 7:30 and the performance starts at 8; $6.50, $5 for students and seniors; 445-6416. IN VIRGINIA

The Annual Potomac Dollhouse and Miniatures Show and Sale is Saturday and Sunday from 10 to 5 at the Tysons Corner Holiday Inn; $3, $1 for children under 13; 978-5353 . . . "The Irish Brigade" offers free living-history demonstrations of the Civil War Sunday from noon to 5 at the Fort Ward Museum, 4301 W. Braddock Road, Alexandria; 838-4848.