On the occasion of the PhD defense of Nikolay Martynchuk we are organizing a mini-workshop in Groningen on Thursday 20 September 2018 with talks by Alexey Bolsinov, Holger Dullin, Sonja Hohloch, Andreas Knauf, San Vũ Ngọc, and Nikolay Martynchuk. More information is available on the workshop website. The PhD defense will take place on Friday 21 September at 11:00.