"You know what this is about? Harry just wants his face back in the newspapers again. We’ve had rumours of Voldemort coming back from the Daily Prophet once a year every year."
-- Draco Malfoy (CC1.12)
A public meeting is called at the Ministry of Magic by Minister Hermione Granger, to discuss the movements of Lord Voldemort’s former allies and ask for vigilance regarding Dark Magic – all worrying signs. It descends into name-calling and chaos when Draco Malfoy accuses Harry Potter of inventing the pain in his scar as an attention-seeking publicity ploy (CC1.12).
This takes place after dropping off their children at King's Cross, but before Albus Potter and Scorpius Malfoy fail to appear to school - so occurs sometime during the first of September, likely to have been scheduled in the afternoon.
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: Harry Potter and the Cursed Child, Parts One and Two