COMETA (COmprehensive Multiboson Experiment-Theory Action) is an EU-funded project that aims to connect members of the HEP theory, experiment, and Machine Learning communities, with the goal of improving measurements of multi-boson processes at the (HL-)LHC and their interpretation. 
The vast research program covered by COMETA includes precision calculations, EFT and BSM interpretations, the development of jet-substructure algorithms, and W/Z polarization taggers. 
COMETA also aims to create an inclusive and informal environment where young scientists and researchers based in underfunded European countries can gain international visibility.

More information and a link to join the network can be found at https://www.cost.eu/actions/CA22130/

Comprehensive Multiboson Experiment-Theory Action
https://www.cost.eu