Saint Isidore 2017 - Castrillon from May 12 to May 14. Past days. Friday, May 12 Saturday, May 13 Sunday, May 14 You might be also interested in: Saint Isidore 2017 - Soto del Barco - 9 Kms. Saint Isidore Fair 2017 - Llanera - 18 Kms.