Spain is divided into 16 political regions. They are called comunitats autonomas, and Catalonia is one of them. We have some political power. Some people are happy with the power we have, some others would like to have more power and some would even like Catalonia to be an independent country.
The correfocs is a festival, in which "devils" play with fire and with people. These devils are not evil; they are full of energy, happy and gay, dancing to the sound of drums and the gralla (a tradicional instrument), while they the fireworks go off.