"Saw them on the roof together, near the owlery with Scorpius playing the gooseberry. Nice to see my love potion being used well, I thought."
-- Ron Weasley (CC3.17)
"I know I don’t have a niece because I never had any brothers and sisters. And nor did my wife."
-- Amos Diggory (CC3.18)
Ron Weasley and Hermione Granger are in her office at the Ministry of Magic. He reveals that he was drunk at their original wedding and, knowing that they loved each other in other timelines, would like to have a marriage renewal ceremony (CC3.17).
When Harry Potter, Ginny Weasley and Draco Malfoy arrive to say that their sons Albus and Scorpius are missing again. Ron offers another explanation for Albus’s disappearance – he says he saw Albus in Hogwarts with an older woman who had blue and silver hair – Delphi (CC3.17).
They immediately go to the St Oswald’s Home, where Harry Potter and Draco Malfoy confront Amos Diggory. Amos denies knowing Delphi or even having any such relatives in his family. Harry and Draco realise they need to find out quickly who Delphi really is (CC3.18).
At the same time or just after the previous event, likely October 2020
This event takes place in the Repaired timeline, as described in the essay "Albus Potter and the lesson in Quantum Mechanics" by Nick Moline.
Somehow the idea that Ron was too drunk to remember his first wedding to Hermione is believable. Their love for each other is a constant surprise to themselves (CC3.17).
From the Web
Pottermore: Harry Potter and the Cursed Child
The theatre production opened in the West End of London at the Palace Theatre on 30 July 2016, with Noma Dumezweni in the role of Hermione Granger, Paul Thornley as Ron Weasley, Jamie Parker as Harry Potter, Poppy Miller as Ginny Weasley and Alex Price as Draco Malfoy: Harry Potter and the Cursed Child, Parts One and Two