Experience Basque Culture With one of the largest Basque populations outside of Spain, Boise is the perfect place for a festival celebrating its culture. The San Inazio (St. Ignatius) Basque Festival is held on the weekend nearest July 31, which commemorates the saint's birthday. Downtown Grove Street is closed off while dances are held Saturday and Sunday nights. On Saturday afternoon, taste the Basque flavor with music, dance and sport exhibitions. Admission is free to most of the events.