Announcement of the conference „Trends in Mathematical Modelling, Simulation and Optimisation: Theory and Applications“ 12. Januar 202120. Januar 2021 We are pleased to announce the online conference „Trends in Mathematical Modelling, Simulation and Optimisation: Theory and Applications“ on March, the 2nd and 3rd, 2021, organized by the CRC TRR154-2 („Mathematical Modelling, Simulation and Optimization using the Example of Gas Networks“) in cooperation with Marie-Curie ITN MINOA („Mixed-Integer Nonlinear Optimization: Algorithms and Applications“). It aims at connecting leading experts in applied mathematics, computer science and engineering, with the objective of stimulating fruitful discussions between researchers and industrial partners on today´s challenges in the energy sector, logistics and engineering with a main focus on network problems. See https://www.trr154.fau.de/trends-in-mathematical-modelling-simulation-and-optimisation/ for further information.