The appearance, a lecture/performance at the Metropolitan Museum, has been rescheduled for May 15 at 8 p.m.
At the event, the third in Watts' series at the Met this season, the pianist will perform and discuss Beethoven's Sonata in D major, Op. 10, No. 3. He has performed at the museum a total of 13 times.
Tickets for the April 30 event will be honored on May 15. For more information, call 212-570-3949.