Spirits of the Season

The Manassas Museum presents its third annual fall event, "The Haunting of Liberia Plantation," 5-9 p.m. Saturday. Tours of the mansion are offered every 20 minutes. Ages 13 and older, $15; museum associates, $12. 703-257-8264. Meet at the Manassas Museum, 9101 Prince William St., Manassas.

Concert

The Prince William Symphony Orchestra performs works by Johann Strauss, 7 p.m. Saturday and 5 p.m. Sunday. Grace Metz Middle School, 9700 Fairview Ave., Manassas. Advance tickets: $23, general admission; $18, ages 62 and older and 18 and younger. At the door: $25, general admission; $20, ages 62 and older and 18 and younger. 703-257-1811.

Art Show and Sale

This exhibition, sponsored by the Prince William Art Society, will be held during the Brentsville Historic Walking Tour and Lecture. Noon-4 p.m. Saturday, Brentsville Courthouse Historic Centre, 12239 Bristow Rd., Brentsville.

That Ain't Hay

The Haunted Barns are full of fun and mischief in celebration of the Halloween season. There is also a children's Boo Barn for ages 2-12. 7-11 p.m. Friday and Saturday and 6:30-10:30 p.m. Sunday, Prince William County Fair Grounds, 10624 Dumfries Rd., Manassas. $8. 703-792-7275, Ext. 201.

"A Dormant Seed," by Mary Follon, is among the works to be exhibited Saturday by the Prince William Art Society.