Designed by Vittorio Gregotti in collaboration with Mario Botta and Elisabetta Fabbri , the fan-shaped , two-level , 2,375-seat auditorium was inaugurated with a performance of Verdi 's `` La traviata `` on 19 January 2002 , and went on to allow the continuation of La Scala 's 2001/2002 opera season .
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