On April 14th of 1931, Spanish Second Republic was proclaimed. I have seen a little reference as a piece of news in the English Wikipedia

After 74 years, this has been rememebered from some balconies in Cerdanyola del Vallès.

Some hours before that Spanish Republic was proclaimed, Lluís Companys and others proclaimed the Republic from Barcelona City Hall. Later, the Catalan president Francesc Macià proclaimed the Catalan Republic from the Barcelona City Hall Generalitat Palace, but it did not go too far...

Photo from Moviment Ridiculista d'Alliberament Nacional

Update: I have changed the post regarding to the succession of the events thanks to the received comments. I have also found a web about the Second Spanish Republic in Catalonia.