The 24th International Congress on Modelling and Simulation (MODSIM2021) will be held at The University of Sydney and Interna ... tional Convention Centre Sydney, Darling Harbour, from Sunday 5 to Thursday 9 December 2021 with a workshop day on Friday 10 December. ASOR will be joining us again for the 28th National Conference of the Australian Society for Operations Research, as will the DST Group led Defence Operations Research Symposium (DORS 2021). Furthermore, we will also be joined by iEMSs for the 2nd regional International Environmental Modelling and Software Society meeting and by the International Microsimulation Association. MSSANZ has held biennial congresses since 1974 that typically attract 600–900 participants. read more