Bonfires of the Immaculate Conception Activity · San Carlos del Valle, Campo de Montiel, Ciudad Real Image of San Carlos del Valle, not of the place itself. In San Carlos del Valle (Campo de Montiel, Ciudad Real), on the night of 7 December, the eve of the Immaculate Conception, residents light bonfires throughout the village. The tradition marks the start of the 8 December patronal festivities and brings the town together around the fire in the streets. 7 de diciembre Photo: Bic (CC BY-SA 4.0) What to see and do in San Carlos del Valle