Festivities of San Gregorio de Arenales Activity · Arenales de San Gregorio, La Mancha, Ciudad Real Image of Arenales de San Gregorio, not of the place itself. The patronal festival of Arenales de San Gregorio (Ciudad Real) is celebrated on 8 and 9 May in honour of its patron saint, San Gregorio Nacianceno, and of the Immaculate Conception, with a procession and popular events in the middle of spring. The village's festive calendar also includes the feast of San Antón, on 17 January, the Día de la Constitución municipal (municipal Constitution Day), on 20 February, and the August festivities, around the 15th. 8 y 9 de mayo Photo: Thor8 (CC BY-SA 3.0) What to see and do in Arenales de San Gregorio