The patroness of Las Plassas is Saint Mary Magdalene (santa Maria Maddalena), celebrated on 22 July; the municipality holds the church of Santa Maria Maddalena.
The calendar of feasts includes 20 January, Saint Sebastian, with the bonfire lit on the evening of the eve, and 8 September, the Nativity of the Virgin Mary. The municipality also holds the church of Nostra Signora delle Grazie and archaeological sites such as Bruncu Forru, Perda Molloni and Santa Vittoria.
