By the 1960s and 1970s, the Carnival had evolved into an entirely popular event with mass participation, bringing in many visitors to the city. Sister cities such as El Segundo, California and Mesa, Arizona were invited to participate. After the inauguration of the Plaza de los Tres Presidentes, the event was moved to this larger plaza, which allowed for carnival rides and concerts by regionally and nationally known artists. The use of masks was banned due to violence. The traditional queen is now popularly elected, and the King is named the "Rey Feo" (Ugly King). Over time, the new plaza was no longer large enough to hold the event, and an admission charge was instituted. Security was instituted as well as checkpoints for weapons. The coronation of a Gay King was begun, and the number of floats participating in the parade grew.