The first authorized Diada after Francoism Historical milestone · Sant Boi de Llobregat, Baix Llobregat, Barcelona Image of Sant Boi de Llobregat, not of the place itself. On 11 September 1976 Sant Boi hosted the first authorised celebration of the National Day of Catalonia after the death of Franco, before the tomb of Rafael Casanova. It brought together tens of thousands of people and marked the transition. 1976 Photo: Gutca (CC BY-SA 4.0) What to see and do in Sant Boi de Llobregat