Muggles of the world, it’s almost your time to experience the next official Harry Potter story. 

For some Muggles, that time has already come. Public preview performances of new play Harry Potter and the Cursed Child began in London’s West End on Tuesday.

But with the official opening yet to come on July 30 (Neville’s birthday) and the worldwide print release of the play’s script set for July 31 (Harry’s birthday), J.K. Rowling is asking lucky attendees at the preview shows to “keep the secrets,” even giving them pins bearing the hashtag #KeepTheSecrets.

“You’ve been amazing for years at keeping Harry Potter secrets so you didn’t spoil the books for readers who came after you,” the author said in a video on the play’s official Twitter account. “I’m asking you one more time to keep secrets and let audiences enjoy Cursed Child with the secrets that we’ve built into the story.”

Cursed Child is set 19 years after the events of Harry Potter and the Deathly Hallows. Photos of the cast members in costume have been released leading up to the play’s opening. But now we have our first look at the Hogwarts set in the play. Check it out below:

An enthusiast of time travel stories, film scores, avocados and Charades, Emily Rome is an alumna of Loyola Marymount University and a native of beautiful Washington State. Emily’s writing has also appeared in the Los Angeles Times, Entertainment Weekly and The Hollywood Reporter. Follow her on Twitter @EmilyNRome.