2500 meters above sea level, but FIFA has since allowed international FIFA games in this stadium. Concerts Until the field was renovated in 2005, many musical concerts were held in the stadium. Concerts and other cultural events were soon banned to protect the grass on the field. Concerts were then held at the Simón Bolívar Park, Palacio de los Deportes Arena, Movistar Arena, Plaza de Toros de Santamaria, Jaime Duque Park and Corferias. December 15, 2011 the Congress approved a law that requires mayors to provide the use of stadiums in all Colombian cities at least once a month. Days later president Juan Manuel Santos approved the law. In consequence, since 2012 the stadium can be used again as venue for cultural events and it opens the possibility for great international singers to perform in Bogotá in 2012. The Ministry of Culture, Recreation and Sport and the Institute for Recreation and Sport (IDRD), utilized various techniques to determine the impact of large events on the grass of the sports arena. Tests simulated the effects of a large crowd on the field. "The first stage of the test consisted of pruning, surveying, geotechnical engineering and agronomy of 100 square meters of turf," said District. Also installed were protective devices that distributed weight and allowed photosynthesis to occur. Next a stage was installed and 400 graduates of the police auxiliary took the field, under which were placed the various turf protection elements, until a density of four persons per square meter was achieved, which is the density typical of large events. The staff entered at 4:00 pm and stayed until 10:00 pm. March 8, 2012 the Ministry of Culture, Recreation and Sport confirmed that the stadium would again, after a 4-year pause, host concerts and cultural events. On March 15, 2012 concert producer Fernan Martinez and Bogotá Mayor (Gustavo Petro) confirmed that Paul McCartney would perform during his On the Run Tour on April 19, 2012 at the stadium. On March 27 at 4:00 p.m. tickets for the concert became available in TuBoleta and at 5:30 p.m. 75% of the tickets were already sold. It is expected for the show to sold all the tickets in less than 24 hours. On March 27 tickets started to be sold at 4:00 p.m. and one hour and a half later 75% of the tickets were already sold. 24 hours after 90% of the tickets