From Sustainazility Wiki
Barn raising is an event during which a community comes together to assemble a barn for one or more of its households, particularly in 18th- and 19th-century rural North America.
In the past, a barn was often the first, largest, and most costly structure built by a family who settled in a new area. Barns were essential structures for storage of hay and keeping of horses and cattle, which in those days were an inseparable part of farming.
The tradition of "barn raising" continues, more or less unchanged, in some Amish and Old Order Mennonite communities, particularly in Ohio, Indiana, Pennsylvania, and some rural parts of Canada. The practice continues outside of these religious communities, albeit less frequently than in the 19th century, in the U.S. states of Maine, New Hampshire, Vermont, and Wisconsin.