Dark Side of the Universe 2025, July 7-11, Toronto The 19th International Workshop on the Dark Side of the Universe (DSU2025) will be held from July 7 – 12 2025 at the new science campus of the Université de Montreal and is co-organized by McGill University and the Université de Montreal. Workshop Website

Making Neutron Stars a Laboratory for New Physics, June 9-13, 2025 at CERN This one-week TH-Institute (June 9-13, 2025) aims to bring together leading experts in nuclear physics, astrophysics, and particle physics to address the key questions surrounding the equation of state (EOS) of neutron star (NS) matter and its impact on multi messenger astronomy and new physics searches. Workshop Website

12th LISA CosWG Workshop, June 2-6, 2025 in Tallinn The workshop’s objective is to convene the LISA Cosmology Working Group community to examine recent advancements in cosmology pertinent to LISA. Its purpose is to kickstart collaborative projects and tackle unresolved issues in LISA cosmology. Workshop Website

Gravitational Wave Probes of Physics Beyond Standard Model 4, June 23-27, 2025 at University of Warsaw The purpose of this workshop is to discuss how gravitational waves may serve as tools to explore possible fundamental physics beyond the Standard Model, such as first-order phase transitions in the early Universe, cosmic strings, primordial black holes and scenarios for cosmological inflation. In addition, it will explore how gravitational wave signals may reveal possible modifications of general relativity. With these aims in mind, the workshop will bring together experts in particle physics, cosmology and the gravitational wave community. Workshop Website

10th Physics and Astrophysics at the eXtreme Workshop and 3rd Cosmic Explorer Symposium, June 30 – July 3, 2025, Urbana, Illinois The meeting aims to explore how gravitational and electromagnetic wave observations can help us understand extreme physics, including strong gravitational fields, dark matter, nuclear physics, cosmology, and multimessenger astrophysics. The Cosmic Explorer Symposium will bring together the community to discuss important aspects of the design and operations of the Cosmic Explorer gravitational-wave observatories, covering both observational and instrument science. Together, PAX-X and the Cosmic Explorer Symposium will explore the science opportunities that come with the next-generation gravitational-wave detectors. Workshop Website

2025 GW Open Data Workshop, May 12-14 Open Data Workshops provide participants with a hands-on introduction to working with data from LIGO, Virgo, and KAGRA. The workshops include lectures, software tutorials, and a data challenge that asks participants to find binary black hole merger signals in real observatory data. Hybrid format. Workshop Website

2025 North American Einstein Toolkit Workshop, June, 9-13 at University of Texas at Austin The 2025 edition of the North American Einstein Toolkit Workshop will be held at the University of Texas at Austin. This is an opportunity for researchers and students to learn about the Einstein Toolkit (https://einsteintoolkit.org/), a community-driven software platform of core computational tools to advance and support research in relativistic astrophysics and gravitational physics. Workshop Website

APPEC Town Meeting 2025, September 23–24 at Universidad de Zaragoza Town Meeting 2025: Preparation of the 2027-2036 Strategic Roadmap. As input for the preparation of the roadmap, a community survey took place beginning of this year. A briefing book including all Astroparticle Physics topics from the survey will be prepared by the APPEC Scientific Advisory Committee and released this summer, stay tuned! Meeting Website

35th Midwest Relativity Meeting and „EricFest“, October 31 – November 2, 2025 at University of Guelph The 35th Midwest Relativity Meeting will be held at the University of Guelph on October 31 to November 2 (Friday to Sunday), 2025. The last day will be a scientific celebration of Eric Poisson’s 60th birthday with invited speakers. Meeting Website

XV ET Symposium, May 26-30 2025 in Bologna The Symposium will be organized in parallel sessions, hosting workshops managed by the ET boards (EIB, ISB, OSB, and SPB), and plenary sessions. The complete timetable is under construction and will soon be released. The registration is open. Symposium Website