American Dance Festival (ADF)ADF is a summer festival of modern dance performances started in 1934. Site includes dance news and information on the ADF Archives, which documents the festival, videotaping performances, showings, classes, panel discussions, and other special events. Videos are available through interlibrary loan. In addition to Festival materials, the Archives collects videos, photos, audiotapes, and personal papers created by other individuals and institutions that document aspects of modern dance.