The Autonomous Agents and Multiagent Systems (AAMAS) conference series gathers researchers from around the world to share the latest advances in the field. It is the premier forum for research in the theory and practice of autonomous agents and multiagent systems. AAMAS 2002, the first of the series, was held in Bologna, followed by Melbourne (2003), New York (2004), Utrecht (2005), Hakodate (2006), Honolulu (2007), Estoril (2008), Budapest (2009), Toronto (2010), Taipei (2011), Valencia (2012), Saint Paul (2013), Paris (2014), Istanbul (2015), Singapore (2016), São Paulo (2017), Stockholm (2018) and Montreal (2019). This volume is the proceedings of AAMAS 2020, the 19th conference in the series, which was to be held in Auckland in May 2020. AAMAS 2020 invited submissions for a general track, a Blue Sky Ideas track, and a track to present papers from JAAMAS (the journal Autonomous Agents and Multi-Agent Systems) that had not previously been presented at a major conference. The Blue Sky Ideas track was chaired by Alessandro Ricci and Juan Antonio Rodriguez. Rym Zalila-Wenkstern and P?nar Yolum solicited papers for the JAAMAS Presentation Track from the papers that appeared in JAAMAS within the preceding 12 months. A group of Area Chairs (AC) was selected to help oversee the review process of the main track. The ACs performed an initial check of submissions and recommended summary rejection of those that did not meet the AAMAS scope, submission or formatting |