Most societies often face social dilemmas in which there can be contradictions between individual interests versus those of the community as a whole. Hunter-fisher-gatherer societies can be considered as paradigmatic examples of these phenomena. The fact that many of these societies tend to live permanently disaggregated produces a specific need for maintaining the social tissue as well as for reproducing social and economic knowledge and values that depend on individual behaviour. Therefore, aggregation events are of special relevance as they represent the optimal occasion to deal with specific social aspects that in these cases need extraordinary circumstances to be held. Our case of study is focused on cooperative processes developed by historical hunterfisher- gatherer-societies from the Beagle channel (Tierra del Fuego), that developed their existence mainly through an economy focused on the exploitation of coastal and maritime resources. Yamana households moved across the territory in their canoes in search for needed resources. In spite of this, Yamana society has different ways to strength social cohesion: visiting each other or because of the celebration of different types of ceremonies. Initiation ceremonies were of special relevance, and the need for maintaining the group meanwhile these rituals were being developed became essential. The finding of a beached whale, and the subsequent aggregation event that took place through a public call, created the ideal context for the development of economic and social processes in a cooperative way.