 Since the 1990s, new construction technology allows some rings to be covered permanently or temporarily.The primary purpose of the ring is bullfighting, but it is usually limited to some festival weeks in the year.In other times, it may be used as a concert venue as in the "Rock en el ruedo" tour of Miguel Ríos or the live record "Diamonds & Rust in the Bullring", featuring a Joan Baez concert in the Bilbao plaza.