There were three contributions during the group’s meeting on Thursday 11.10.23. Petr Kotlařík from UTF discussed his study on “QNMs of black holes encircled by a gravitating thin disk”, Dr. Giulia Ventagli from FZU discussed “Black Holes and Neutron Stars Scalarization in generalised scalar-tensor theories” and Vitkor Skoupý from ASU presented “Gravitational wave templates from Extreme Mass Ratio Inspirals” along with an animation. We also discussed the GW@CZ workshop, which will take place on the 1.12.2023 at GFÚ.