There were three scientific contributions during the group’s meeting on Wednesday 29.9.21. . Dr. Tomáš Ledvinka from UTF gave a talk on “Universality of curvature invariants in critical vacuum gravitational collapse”, Dr. Ondřéj Kopáček from ASU talked about “Null Points in the Magnetosphere of a Plunging Neutron Star” and Dr. Asen Christov from FZU talked about “LISA Mission and the Czech involvement”.