"You know, Harry's boy Albus - said to me the other day that he thought you and I were - married…. He even thought we had a daughter. That'd be strange wouldn't it?"
-- Ron Weasley (CC2.17)
Hermione Granger and Ron Weasley meet on the staircases at Hogwarts. Ron has come because his son Panju is in trouble, but something about Hermione draws him towards her. Something about Ron moves her as well (CC2.17).
Around the same time as the previous event, September 2020
This event takes place during the Roseless timeline, as described in the essay "Albus Potter and the lesson in Quantum Mechanics" by Nick Moline.
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 31 July 2016, with Noma Dumezweni in the role of Hermione Granger and Paul Thornley as Ron Weasley: Harry Potter and the Cursed Child, Parts One and Two