CHEP 2018: Preface to the Proceedings Alessandra Forti, Latchezar Betev, Maarten Litmaath, Oxana Smirnova, Petya Vasileva, Vassil Vassilev and Peter Hristov EPJ Web Conf., 214 (2019) 00001 Published online: 17 September 2019 DOI: 10.1051/epjconf/201921400001