Machine Learning and Knowledge Discovery in Databases. Applied Data Science and Demo TrackThe 5 volume proceedings, LNAI 12457 until 12461 constitutes the refereed proceedings of the European Conference on Machine Learning and Knowledge Discovery in Databases, ECML PKDD 2020, which was held during September 14 18, 2020. The conference was planned to take place in Ghent, Belgium, but had to change to an online format due to the COVID 19 pandemic. The 232 full papers and 10 demo papers presented in this volume were carefully reviewed and