Question: When the Ohrid Summer Festival  became one of the members of the European Festivals Association?
Sentence (from "Ohrid Summer Festival"): Many world-renowned musicians like Leonid Kogan, Svyatoslav Richter, Grigory Sokolov, Andre Navarra, Martina Arroyo, Henryk Szeryng, Ivo Pogorelić, Mstislav Rostropovich, Aldo Ciccolini, Gidon Kremer, Ruggiero Ricci, Viktor Tretiakov, Salvatore Accardo, Elena Obraztsova, Katia Ricciarelli, Victoria de los Ángeles, Maxim Vengerov, Vadim Repin, Julian Rachlin, Michel Camilo, Paul Meyer, Dmitri Hvorostovsky, Leo Nucci, Barbara Frittoli, Jessye Norman, Nigel Kennedy, Zubin Mehta, Ennio Morricone, Mikhail Pletnev, and many other have performed at Ohridski Leto.
Relevant evidence: No