Dear Colleagues: I am pleased to invite you to a dedicated workshop on high-temperature pressure calibration, which will be held on the afternoon of 28 September 2025 at Ehime Kenmin Bunka Kaikan (Ehime Prefectural Convention Hall), Matsuyama, Japan, as a pre-meeting event of AIRAPT-29. https://smartconf.jp/content/airapt29/program The goal of this workshop is to develop reliable pressure calibration methods at high temperatures for use with diamond anvil cells (DACs) and multi-anvil (MA) presses, with the aim of achieving consistent and reproducible pressure values across laboratories and techniques. This initiative builds upon the recent activities of the AIRAPT IPPS Task Force, which focused on establishing room-temperature pressure reference points (PRPs) for the MA community. That effort sought to link traditional MA PRPs to the Ruby2020 pressure scale, recently recommended to the DAC community, thereby enhancing cross-platform consistency. A key milestone in this effort was the room-temperature pressure calibration workshop held on 23 July 2023 at the Edinburgh International Conference Centre, where community consensus began to emerge around a set of revised PRPs up to ~30 GPa. Moving forward, we recognize that room-temperature PRPs are only the first step. High-temperature calibration is critical for the reliability of high P-T experiments in Earth and planetary sciences (e.g., understanding deep mantle processes, planetary interiors) and materials science (e.g., synthesis of novel materials, studies of phase diagrams). However, temperature-dependent uncertainties in pressure determination remain a major challenge. Thus, this upcoming workshop will focus on sharing approaches, experimental data, and strategies toward defining robust pressure reference schemes at high temperatures. The following invited speakers have confirmed their participation: * Agnès Dewaele (CEA/DAM/DIF, Arpajon, France) * Bin Chen (University of Hawai‘i at Mānoa, Honolulu, HI, USA) * Renata Wentzcovitch (Columbia University, NY, USA) * Robert Farla (DESY, Hamburg, Germany) * Kurt Leinenweber (Arizona State University, Tempe, AZ, USA) * Yu Nishihara (Ehime University, Matsuyama, Japan) We strongly encourage all participants—especially early-career researchers and experimentalists actively working with high P-T apparatus—to give a presentation and contribute their ideas, results, or perspectives on high-temperature pressure calibration. Short presentations highlighting challenges, datasets, or proposed approaches are especially welcome. If you would like to present your work or simply to participate in the discussion, please contact me at: 📧 tomo.katsura@uni-bayreuth.de<mailto:tomo.katsura@uni-bayreuth.de> Tomo Katsura (University of Bayreuth, Bayreuth, Germany) Workshop Organizer I hope that many high P-T researchers will join us in Ehime to help shape the future of pressure calibration at high temperatures. Tomo Katsura