Description: ATO Special Gatherings Subject Files (1910-2012), including correspondence, publicity, photos, scrapbooks, memorabilia, news reports, planning materials, and guest book registers for gatherings in addition to routine ATO Congresses, including the ATO Centennial (1965), Quasquicentennial (1990), and Sesquicentennial (2015). Also included is material related to the dedication of the National Headquarters (1965) and tributes presented at Congress. Includes ATO Night, ATOvernight, and Awards Banquets.