Spatiotemporal patterns can emerge from the collective dynamics of interacting constituents of flowing complex and active fluids. They typically result from a hierarchy of processes occurring at different length and time scales, and thus a proper theoretical description of such systems requires coarse-graining the local interactions to access the relevant scales. The comparison with experimental results is fundamental to validate the models and test predictions. This workshop aims at bringing participants in the areas of complex fluids and active fluids developing experimental and theoretical/numerical work, to explore possible synergies.