IUPAP: The International Union of Pure and Applied PhysicsCOMMISSION ON MATHEMATICAL PHYSICS (C18)
http://archive2.iupap.org/commissions/c18-mathematical-physics/news/
IUPAP C11, Particles and Fields, is soliciting applications from institutions interested in hosting the Lepton Photon Symposium in 2021
http://archive2.iupap.org/commissions/c11-particles-and-fields/c11-news/