21 May, 1984 was a momentous occasion in the history of Iyengar yoga and for the Iyengar Yoga studios in Maida Vale. BKS Iyengar, who was 65 at the time, gave a talk and demonstration before an audience of 2,000 at the Barbican Centre in London. He talked about Patanjali and the eight limbs of yoga and he gave a demonstration of pranayama and asanas. The occasion also included a performance by some of his close students that had been rehearsed at Maida Vale. Guruji generously donated the entire income from the evening to build the new studios at Maida Vale.