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 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

Fourth MaNiTou Summer School on Gravitational Waves: A new window to the Universe, Jun 30 – July 5, 2025, Marseille The school is collaboratively organized by scientific communities involved in Gravitational Waves, from 3 French locations in Southern France, namely Marseille, Nice and Toulouse, thus the MaNiTou name for the school. Registration to the 4th edition of the MaNiTou Summer School on Gravitational Waves is now open for registration until April 6th, 2025. School Website

SIGRAV2025, September 8-12, Milano The conference will cover various aspects of Classical and Quantum Gravity, including tests of General Relativity, cosmology, gravity experiments, and gravitational waves from experimental, theoretical, and data-analysis perspectives. Conference Website

Black Holes & Cosmology, August 5-9, 2025 at University of Iceland The purpose of the conference Black Holes & Cosmology is to bring together world-renowned experts as well as junior researchers working on theoretical and observational aspects of black holes, particularly (but not limited to) their rôle in cosmology. Conference Website

Massive Black Holes at EAS 2025, Cork, June 23-24, 2025 Symposium on „Understanding and Interpreting Massive Black Holes in the Early Universe“ at EAS 2025 in Cork, organized by John Regan and Michael Tremmel. This symposium will take place across June 23rd and 24th (first two days or the symposium). Within this session there will be dedicated blocks focused on signatures of massive black hole binaries and the organizers encourage abstracts from the GW community in this direction. Within EAS there are of course multiple other sessions and symposia focused on Massive Black Holes (e.g.Modelling the First Billion Years) all of which may appeal those with research interested in MBH(B)s.…