A festival mood will prevail in towns and villages up and down the nearby countryside this weekend:

Fredericksburg's Market Square Fair, Saturday from 9 to 5, will feature weavers, quilters, costumed hostesses and pit-cooked barbecue.

Butter-churning, soap-making and blacksmithing are some of the colonial chores you can try at Sully Plantation; and for a break there'll be games, music and dancing, Saturday and Sunday from 11 to 5. Admission is $2 for adults; $1 for children, on Route 28 near Chantilly. Call 437-1794.

"Discovery Day" at Green Spring Farm Park in Annandale, Sunday from noon to 4, will feature demonstrations and sales of crafts in wood, clay, glass, quilting and such like. Free. It's just off Route 236 (Little River Turnpike) near Braddock Road.

In Maryland, visitors can go back to the 1780s at Calvert County's annual Cavalier Days in Prince Frederick, from 11 to 6:30 Friday and Saturday; 12:45 to 6:30 Sunday: seafood and strawberry pie, lemonade and stuffed ham; costumed musicians and craftsmen; dancing and dueling; colonial games and military parades. Admission is $2, free to children under 12. Take Pennsylvania Avenue extended south. Call 855-1726.

The Crestwood Village Spring Crafts Fair, in Frederick, will display turn-of-the-century skills of woodworking, winemaking, barbershop singing and square dancing. It's from 5 to 8:30 Friday, 10 to 8:30 Saturday and 10 to 5 Sunday, at the village clubhouse, 6902 Arbor Drive. Call 301-662-8900.

In Mt. Airy, Saturday is "Old-Timers' Day," with a Civil War reenactment, magic acts, old movies, street musicians and baked goods, crafts and arts on sale, starting at 10.Call 831-7211.