Just as we have our Civil War reenactments, the Spanish have them, too, but not that Civil War - one which came much earlier, between the 8th and 15th centuries. You can read more about it here.
Festivals commemorate these battles - between Christians and 'Moors' (Muslims from Morocco though not only - hence the name) all through Spain. This video is from the festivities in Petrer.
These festivals are not loved by everyone. You can read about opposition to them here.