Outdoor Concert

The Manassas Museum hosts the Celtibillies as part of the SummerSounds concert series, sponsored by the museum and the Center for the Arts. 6:30 p.m. Saturday on the lawn of the museum, 9101 Prince William St., Manassas. Free. 703-330-2787.

Murder Most Farcical

This murder-mystery-musical spoofs Agatha Christie whodunits. It has all the components of a murder mystery -- a stormy night, a spooky old mansion and a corpse. 8 p.m. Tuesday-Friday, 8:30 p.m. Saturday, 7:30 p.m. Sunday, through Oct. 16. Lazy Susan Dinner Theatre, Route 1, off Interstate 95, Woodbridge. Saturdays, $36.95; other days, $34.95. Children 11-15, $30; children 10 and younger, $20. 703-550-7384 or www.lazysusan.com.

Seems Like Old Times

Learn about bygone days, make butter and ice cream, see sword fighting demonstrations and meet the author of a Civil War novel. 11 a.m.-3 p.m. Saturday. Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. Free; reservations requested. 703-792-4800.

Bluegrass in the Night

Bring a blanket or a chair and listen to a performance by the Mark Newton Band. 7:30 p.m. Saturday, PACE West School, 14550 John Marshall Hwy., Haymarket. $5. 703-754-5885.