With all tickets for June through September 2016 gone, and tickets through January 2016 going fast, tickets are now being sold here from Jan. 11, 2017-May 27, 2017.

And that's long before the show has been cast, let alone gone into rehearsal. As Playbill.com correspondent Mark Shenton wrote, "Inevitably, given the demand, there have been complaints about the online booking systems failing to cope; the producers have commented, 'With over 70,000 people trying to purchase tickets at one time the ticketing systems are currently working at capacity. Customers who are having difficulties with the online booking system can be assured we are doing everything we can to ensure the process is as smooth and efficient as possible. At this stage the vast majority of customers have had their bookings processed within an hour.'"

Another snag has been people buying up the hot tickets as an investment. The producers quickly tweeted, "Please do not attempt to resell your tickets on alternative platforms, as patrons will not be admitted into the theatre."

(2/2) Please do not attempt to resell your tickets on alternative platforms, as patrons will not be admitted into the theatre.

— Harry Potter Play (@HPPlayLDN) October 28, 2015

All tickets for the first booking period (June 7-Sept. 19, 2016) were sold before noon at HarryPotterthePlay.com. As a result, producer Sonia Friedman put on sale seats for the second booking period, through Jan. 8, 2017, to those who registered for priority booking.

Friedman's office issued the statement, "At 7 PM this evening over 175,000 tickets had been sold for the play, which is unprecedented for a theatre production. On Friday (30 October 2015), when general booking opens, to ensure customers are given the best possible chance to obtain tickets the producers will be opening up an additional booking period, details of which will be announced in the next 24 hours."

Producers tweeted the following:

Ticket Update: Best availability for mid-week performances from October 2016 to January 2017; weekend performances are selling very fast.

— Harry Potter Play (@HPPlayLDN) October 29, 2015

Check out Playbill.com's original story on the show.

Described as one play being presented in two parts, the show is being sold initially as a pair only, so the investment required from theatregoers will be up to £130 for the two shows — a new record for non-premium prices for a play in the West End.

Intended to be seen as a complete double bill — with double days on Wednesdays, Saturdays and Sundays, and each part presented alone on Thursday and Friday evenings — tickets will be released for single-performance sales at a later date.

Based on an original new story by J.K. Rowling, Jack Thorne and John Tiffany, Harry Potter and the Cursed Child has a script by Thorne. Previews will begin June 7, 2016, at the Palace Theatre in London's West End. In addition, four special preview performances are planned for the end of May 2016. The official openings of Part One and Part Two are scheduled for July 30, 2016.

Harry Potter and the Cursed Child is the eighth story in the Harry Potter series and the first official Harry Potter story to be presented on stage. Production notes describe the plot thus: "It was always difficult being Harry Potter and it isn’t much easier now that he is an overworked employee of the Ministry of Magic, a husband and father of three school-age children. While Harry grapples with a past that refuses to stay where it belongs, his youngest son Albus must struggle with the weight of a family legacy he never wanted. As past and present fuse ominously, both father and son learn the uncomfortable truth: sometimes, darkness comes from unexpected places."

John Tiffany will direct, with movement by Steven Hoggett, set designs by Christine Jones, costumes by Katrina Lindsay, music by Imogen Heap, lighting by Neil Austin, sound by Gareth Fry, special effects by Jeremy Chernick, illusions by Jamie Harrison and musical supervision by Martin Lowe.

Harry Potter and the Cursed Child is being produced by Sonia Friedman Productions, Colin Callender’s Playground Entertainment and Harry Potter Theatrical Productions.