ACSTAC: Anatolia College of Science and Technology Annual Conference. This is David W. Deeds' workshop on virtual worlds. ACSTAC 2017 will be held Nov. 24-26 at Anatolia College in Thessaloniki, Greece: http://www.acstac.gr/. This is the same workshop Dr. Deeds conducted for last year's ACAMIS (Association of China and Mongolia International Schools) Technology Conference in Suzhou, China.