The proceedings of the conference on “Non-regular Spacetime Geometry” has just been published by Journal of Physics: Conference Series (link here).  It is the proceedings of the conference of the same name held 20-22 June 2017 in Florence Italy.  The volume was edited by Piotr T Chrusciel (U. Vienna), James Grant, Michael Kunzinger (U. Vienna), and Ettore Minguzzi (Florence). The photo to the left shows the participants on the last day of the conference.  A larger version of the photo can be found here.