Researchers around the globe attend the International Symposium on Mathematical Programming (ISMP) to share their latest results in mathematics, algorithms, computation, and modeling. The 2024 edition, held in Montréal over 5 days, gathered close to 1,600 participants and included more than 1,300 talks. Building a reasonable schedule with these figures cannot be done by hand. The objective of this document is to describe how the scheduling, the numerous re-schedulings as well as the room assignment problems were modeled and optimized. Concerning past ISMP conferences, the schedule of ISMP~2018 was done using a tool called ``the Scheduler'', and the present work integrates many ideas from the model of the 2012 and 2015 editions described in Tesch (2013). More widely, the following studies focus on the optimization of conference schedules (Bulh\ôes et al. (2022), Correia et al. (2022), Nicholls (2007), Pylyavskyy (2024), Rezaeinia et al. (2024), et Vangerven et al. (2017).