"Do you still see with my eyes, Harry Potter?"
-- the dream Lord Voldemort (CC3.12)
Harry Potter has a dream about visiting Godric’s Hollow with his Aunt Petunia, who tries to explain away the flowers for Lily and James. He again hears the voice of Lord Voldemort and sees his son Albus (CC3.12).
As he talks about his dream with wife Ginny, Harry realises his dream means that Lord Voldemort is still active and they are in danger (CC3.13).
The night of the previous event - likely early 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.
Similar to what she told him when he lived with the Dursleys, Harry's Aunt Petunia denies that there was anything good about her sister Lily and Harry's father James:
"she repelled people.... and your father…. extraordinarily obnoxious. No friends. Neither of them." (CC3.12).
Harry states that he had never visited Godric's Hollow with his Aunt Petunia (CC3.13). He had talked about it before Bill and Fleur's wedding:
"I thought I might go back to Godric’s Hollow.... For me, it started there, all of it. I've just got a feeling I need to go there. And I can visit my parents' graves, I’d like that." (HBP30).
When he does go there with Hermione he remembers that "he had been little over a year old when he had left this place forever" (DH16). Therefore the dream he has of going there as a small boy is false - and Harry knows it must mean something else.
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 Jamie Parker in the role of Harry Potter and Poppy Miller as Ginny Weasley: Harry Potter and the Cursed Child, Parts One and Two