The 2015 CLIR Unconference & Symposium was the capstone event to seven years of grant funding through CLIR's Cataloging Hidden Special Collections and Archives program. These proceedings group presentations by theme. Collaborations provides examples of multi-institutional projects, including one international collaboration; Student and Faculty Involvement reports on practices of engaging students and faculty in processing as well as outreach; Cataloging presents projects that experimented with unique ways of classifying unusual formats; Arrangement and Description includes a variety of item-level and minimal processing techniques; Audiovisual Collections addresses the unique requirements of and advances in providing access to audiovisual items; Science Collections focuses on how institutions deal with challenges of science and medical collections, including practical ways to address privacy issues; and Outreach describes ways in which projects are engaging current and future patrons. The following presentations are included: Collaborations: (1) All History is Local: Expanding Access to American Jewish Archival Collections (Susan Malbin, Laura Leone, Rachel Miller, Rachel Harrison, Sarah Ponichtera Christine McEvilly, and Kevin Schlottmann); (2) International Collaboration to Reveal Rare Chinese Materials Hidden for Half a Century (Zhijia Shen and Jing Liu); and (3) The Challenges of Sustaining a Long-Term Collaboration: Reflections on the Philadelphia Hidden Collections Projects (David McKnight and Eric Pumroy). Student and Faculty Involvement: (4) Maximizing Partnerships: Faculty Buy-in, Service Learning, and Hidden Collections (Christopher Harter and Elisabeth McMahon); (5) Collaboration and Education: Engaging High School Students with EAC-CPF Research (Valerie Addonizio and Christopher Case); (6) Engaging Students in Complex Description: Two CLIR Hidden Collections Projects (Lois Fischer Black, Ilhan Citak, Gregory A. Edwards, and Andrew Stahlhut); and (7) The "Deceased" Preaches His Own Eulogy: Training Students to Provide Access Points on Discovery-Level Records (Felicia Piscitelli, Lisa Furubotten, Anton duPlessis, Alma Beatriz Rivera-Aguilera). and ℓngel Villalba-Roldǹ). Cataloging: (8) Obstacles and Solutions in Establishing Cataloging Standards for Fine Print Collections (Katharine Malcolm and Christen Runge); (9) The Churchill Weavers Collection: An American Treasure Uncovered (Jennifer Spence); and (10) Pennsylvania German Textile Cataloging (Candace Perry). Arrangement and Description: (11) The Benefits of Planning: Cataloging the Vertical Files of the Anton Brees Carillon Library (Joy M. Banks and Jaime L. Fogel); (12) Discovering the Future: The New York World's Fair Collections of 1939 and 1964 at the Museum of the City of New York and Queens Museum (Annie Tummino); and (13) Preserving a Montana Senator's Image: The Lee Metcalf Photograph and Film Collections Project (Matthew M. Peek). Audiovisual Collections: (14) Accelerating Exposure of Audiovisual Collections: What's Next? (Karen Cariani, Sadie Roosa, Jack Brighton, and Brian Graney); and (15) Putting Archival Audiovisual Media into Context: An Archival Approach to Processing Mixed-Media Manuscript Collections (Megan McShea). Science Collections: (16) The Opportunities of Engagement: Working with Scholars to Improve Description and Access at the Center for the History of Medicine (Emily R. Novak Gustainis); (17) The Practice of Privacy (Emily R. Novak Gustainis and Phoebe Evans Letocha); and(18) Grinnell to GUIDs: Connecting Natural Science Archives and Specimens (Christina Fidler, Barbara Math,̌ Rusty Russell, and Russell D. "Tim" White). Outreach: (19) Opening up the Urban Archive: Digital Outreach to Urban Studies Scholars (Morgan Gieringer and Jaime Janda); and (20) Success Beyond Access: CLIR-ing the Way (Harlan Greene, Dale Rosengarten, and Amy Lazarus). Concluding remarks are presented by William Noel. The following are appended: (1) Unconference Sessions; (2) Posters; and (3) Learning at Work in the Archives: The Impact of Access to Primary Sources on Teaching and Learning (Kelly Miller and Michelle Morton). (Individual papers contain references.)