More than 200 performers, musicians and craftsmen will participate in an old-fashioned Fourth of July celebration from noon to 8:30 p.m., July 14, at the Smithsonian's Museum of History and Technology.

Eight groups, including the Brick Hill Brand, the Van Perry Band, Country Current, the Rockville Brass Ensemble, the Kings Park Civic Band, the Violet Swamp Donkeys, the Sunday Morning Jazz Band and a gospel group, are scheduled to perform at outdoor concerts from 4 to 6 p.m. in the museum's amphitheater on the east side.

Demonstrations and instructions of popular dance styles from 1776 through the 1950s will be offered from 6:30 to 8:30 p.m. near the amphitheater.

John Rusk of Oxon Hill will return as Uncle Sam. Also on hand on the museum's terrace will be an organ grinder and monkey, sidewalk artist, puppet shows, clowns, mimes and antique bicycle demonstrations.

Inside the building professional actors will recite excerpts from speeches such as Patrict Henry's "Liberty or Death" address and Frederick Douglass' "Fourth of July Oration." Roving musicians will play patriotic music while craftsmen sew copies of historic American flags, build model ships, make rope tension drums and the like.

The films "Boston Tea Party" and "Shot Heard Round the World" will be shown several times July 1 to 3. The musical "1776" will be shown twice on July 4.

A complete schedule of events is available at museum information desks. Schedule highlights may be obtained by calling Dial-a-Museum at 737-0811.