All tickets for the first booking period (June 7-Sept. 19, 2016) for the London stage sequel Harry Potter and the Cursed Child sold out within hours during priority sale Oct. 28. As a result, producer Sonia Friedman has put on sale seats for the second booking period, through Jan. 8, 2017, to those who registered for priority booking.
SOURCE: Playbill at 11:04AM on October 28, 2015