folk dance

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A traditional dance originating among the common people of a nation or region.
• noun The music for such a dance.
• noun A social gathering at which folk dances are performed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any dance traditionally performed by the common people of a specific region.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb perform a folk-dance
• noun a style of dancing that originated among ordinary people (not in the royal courts)