The annual event in Madrid's Puerta del Sol featuring the twelve midnight chimes is called the Campanadas.
The word campanadas means “chimes” and is commonly used for the New Year's Eve clock strikes broadcast from the Real Casa de Correos in Puerta del Sol. At midnight, people eat twelve grapes, matching one grape to each chime in the traditional Spanish custom known as the Twelve Grapes of Luck.
The clock tower became a national focus through radio and television broadcasts, allowing people throughout Spain and Spanish-speaking communities elsewhere to follow the timing. The public gathering in Puerta del Sol is one of Madrid's defining New Year's traditions, with celebrants watching the clock and then congratulating one another after the final chime.
Campanadas should not be confused with Spain's other major festivals. Las Fallas is Valencia's March festival, San Fermín is associated with Pamplona's July celebrations, and La Tomatina is the tomato-throwing festival in Buñol. The defining feature of the Campanadas is the midnight clock sequence.