http://en.wikipedia.org/wiki/Lindy_Exchange

A Lindy Exchange is a gathering of Lindy Hop dancers in a city for several days to experience the dance venues and styles in that city while taking advantage of an opportunity to dance with other swing dancers. The modern concept of the Lindy Exchange was an answer to the globalization effort to spread the Lindy Hop dance throughout the world. Although the focus of Lindy Exchanges is on Lindy Hop, related swing dances like Balboa, Charleston, Blues, and Collegiate Shag are common at exchanges as well. The general theory behind the Lindy Exchange was that different cities foster different styles of Lindy Hop dancing, and by traveling and interacting with one another, dancers from many cities can improve their dancing while enjoying the culture, music, and camaraderie found in the host city. Generally, dancers who travel to an exchange will stay at the homes of other dancers in the host city.

Exchanges can vary in size. Some of the older exchanges, such as the Chicago Lindy Exchange and the D.C. Lindy Exchange, can easily have 400 people or more. Exchanges in cities with smaller dance communities may have fewer than 50 people. Lindy Exchanges typically do not have lessons or workshops since the focus is on social dancing.

Exchanges have created a national Lindy Hop subculture where swing dancers around the country have gotten to know one another. Yehoodi is a popular web community among Lindy Hoppers that serves as a place to advertise and discuss Lindy Exchanges.

The first Lindy Exchange occurred on Dec 4-6, 1998 in San Francsico, CA, USA between the cities of Chicago, Illinois and San Francisco, California. The intent of this exchange was for people visting from Chicago to experience the dance styles of San Francisco by visiting many of its established venues and dancing with the Lindy Hoppers there. As the popularity of the Lindy Exchange increased, the events changed from a strict city to city swapping of dancers to an open-invitational gathering of Lindy Hoppers from around the country (and, in some cases, from international locations) to one central city for a particular weekend. Now, many cities around the country and around the world host annual Lindy Exchanges.

and this is relevant because GO TO UTAH LINDY EXCHANGE 2006!