The patron saint of Campiglia Marittima is Saint Florentius of Populonia, celebrated on 15 May.
The town's most distinctive event is Apritiborgo, a theatre and street arts festival born in 2005 through collaboration with the Fine Arts Academy of Florence, livening up the borgo's streets every year. The town holds the Palazzo Pretorio and the Church of the Madonna di Fucinaia, as well as the San Silvestro archaeological-mining park.