There were three scientific contributions during the group’s meeting on Friday 3.12.21. . Mgr. Angelica Albertini from ASU gave a talk on “TEOBREsumS: an Effective-One-Body waveform model for coalescing black hole binaries”, Dr. Ogan Özsoy from FZU talked about “GWs from Axion-Gauge Field Dynamics during inflation” and Dr. Martin Žofka from UTF talked about “Springy relativistic toys”.