Day of the Valencian Community
Just down the coast is the región and city of Valencia, and if you ever fancy a short trip it really is worth it. The City is just under three hours whether driving ot taking the train, so it's not too far for a day trip even.
Valencia and Catalunya kind of share a language although it's unlikely that anyone would admit that, and there are of course regional differences. The Valenciana flag is also similar to the catalán one:
The Day of the Valencian Community (Día de la Comunidad Valenciana) marks the anniversary of King James I of Aragon's capture of the city of Valencia from Moorish forces in 1238.
It is also the Day of Saint Dionysius, a traditional festival for lovers - not unlike that of St Valentín.