Public celebrations of multilingualism forge ideologies of civic belonging that incorporate linguistic diversity into local citizenship. They create a concept of citizenship that embraces historical migration while sharing local space. In Manchester, celebration of language days started in schools, proceeded to neighbourhood events and culminated with the adoption of the UNESCO International Mother Language Day as an annual civic event. The latter is partly motivated by an agenda to effectively market cultural festivals as part of a local creative industry. Celebrations are informed by a city language narrative that relies on public communication of research results. Public display of languages interrogates language hierarchies and claims language rights. But as the city language narrative is anchored more firmly and more widely, the decolonial agenda that it once represented becomes to some extent appropriated by the neoliberal reality.