Here is the schedule of the International Online Piano Masterclass for 2021. From August to October, it will happen in 1pm (Eastern Daylight Time). In November it will also happen at 1pm, but note that at that time the Eastern Time is not Daylight anymore, which means that the masterclass will happen 1 hour later.
October 23, 1pm (EDT).
November 20, 1pm (ET).