CHEP 2018: Preface to the ProceedingsAlessandra Forti, Latchezar Betev, Maarten Litmaath, Oxana Smirnova, Petya Vasileva, Vassil Vassilev and Peter HristovEPJ Web Conf., 214 (2019) 00001DOI: https://doi.org/10.1051/epjconf/201921400001