The events of “castells”, in Catalan “diades”, gather usually from one to four teams, but sometimes there are up to six teams in a performance. They perform per turns and a full performance consists of three towers and 1 pillar per group. Even there is no official score table, the towers are usually valued according to the Biannual competition in Tarragona. All events take place in public squares and are free to enter, except the competition.
During a performance, the towers obtain the best score when the “enxaneta” crowns the tower and all the members climb down of the “castell” (Tower completed). The tower gets a lower punctuation when the it collapses after being crowned (Tower crowned) and have no score when it collapses before the crowner reaches the top of the tower and rises the hand up (attempt).
The music is another important part of the “Castells”. The “gralla” is the main instrument playing the “toc de castells”, the piece to guide the “castellers” during the construction of the tower.