During the week of July 9-13, the PSO group hosts a number of international guests. Dr Ashley Ruiter and Dr Ivo Seitenzahl from the University of New South Wales Canberra (Australia) are visiting for the full week to continue a long-standing collaboration on thermonuclear supernovae. Furthermore, Magda Siwek and Marc Williamson (New York University, US) will visit on July 11. Both are students of Prof. Maryam Modjaz, who is currently a long-term visiting scientist at PSO and the MPIA. On this occasion, we will organise a mini-symposium on Supernova Observations and Modelling at HITS on July 11.