Following the announcement from ESO about the search of its next astronomical ground-based programme for the 2040s (ESO Expanding Horizons), the community is getting organized to prepare the science case, including a reference design concept, for a new millimeter/sub-millimeter facility in the 2040s, which builds upon the successes of the current ALMA Observatory. These efforts are taking place within the ALMA2040 network, a community-driven initiative to define the key scientific questions of the 2040s and translate them into a technical vision for a next-generation transformational (sub)-millimeter facility. The goal of this workshop is to make these European-led efforts better known to the French community and engage further support and contribution toward a coherent and community-endorsed base concept.