Two of PhoQuS partners participated to the 2021 annual Workshop of the GdR Complexe organised by the Laboratoire Kastler Brossel from 13 to 15th of December 2021. Quentin Glorieux (LKB) gave a talk titled Out-of-equilibrium dynamics in a paraxial fluid of light, and Mathias Albert (INPHYNI) on Superfluidity versus thermalisation in non-linear wave systems (Slides).