"I don’t care what you did or who you saved, you are a constant curse on my family, Harry Potter."
-- Draco Malfoy (CC1.17)
At the Ministry of Magic, Hermione Granger holds a meeting with Draco Malfoy, Harry Potter, Ginny Weasley and Ron Weasley to discuss what to do about the missing children Albus and Scorpius. After Draco and Ginny start shouting at each other, Harry admits that Albus may have run away as a result of their argument and taken Scorpius, who Draco says is a “follower not a leader”, with him (CC1.17).
This is the day after Albus and Scorpius escape from the Hogwarts Express and visit the St Oswald's Home - so during 2 September 2020.
Hermione Granger reports that the Food Trolley Witch is upset at this failure of her "Hogwarts delivery record" and thus letting down Ottaline Gambol, who had given her the job. Hermione has also informed the Muggle authorities that the children are missing - something that Draco Malfoy is not happy about (CC1.17).
From the Web
The theatre production opened in the West End of London at the Palace Theatre on 31 July 2016: Harry Potter and the Cursed Child, Parts One and Two