If you're a fan of stage productions, make sure you see a show at Civic Theatre of Castello. Make a reservation ahead of time for the best seats in the house.
You'll have sightseeing choices galore when visiting Cagliari. Civic Theatre of Castello is a great place to kick off here, but there are plenty of other fine places to explore. Bastion of Saint Remy, National Archaeological Museum, and Roman Amphitheatre of Cagliari are near the arts and culture attraction and will round out your day nicely.