There were four contributions during the group’s meeting on Monday 23.9.24. Dr. Ondřej Kopáček from ASU showed “Spherical orbits in Kerr spacetime“, Dr. Federico Urban from FZU presented “Ultra-light dark matter and interferometers“, Dr. Viktor Skoupý from UTF showed “Post-Newtonian expansions of extreme mass ratio inspirals of spinning bodies into Schwarzschild black holes” and Dr. Roman Konoplya from the Opava University presented “The sound of the event horizon“.