The 12th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (ETMM12) will take place in Montpellier, France, on 26-28 September 2018. For the first time, ETMM12 will include thematic mini-symposia gathering selected talks on a single scientific topic or theme. In particular, we would like to see mini-symposia coordinated by ERCOFTAC Special Interest Groups (SIGs); however, also everyone else interested in setting up and chairing a mini-symposium is encouraged and welcome. Please consider this opportunity yourself and/or pass it on to interested colleagues.