camp meeting

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. An evangelistic gathering held in a tent or outdoors and often lasting several days.

from the GNU version of the Collaborative International Dictionary of English

• n. a religious gathering for open-air preaching, held in some retired spot, chiefly by Methodists. It usually last for several days, during which those present lodge in tents, temporary houses, or cottages.

from The Century Dictionary and Cyclopedia

• n. A religious gathering for prayer, instruction, exhortation, etc., held in an encampment formed in a wood, grove, or field, generally continued for a week or more.

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

• n. religious (usually evangelistic) meeting held in a large tent or outdoors and lasting several days