4 years ago Tory MPs were disciplined for speaking at the same event -
"When Kawczynski attended a similar event, the party did not remove the whip but did give him a formal warning that his attendance “was not acceptable, particularly in light of the views of some of those in attendance, which we utterly condemn, and that he is expected to hold himself to higher standards”.
The difference now isn't that the politics has shifted further to the right.
It's that Sunak has zero party discipline. He can't reprimand Braverman (as I am sure she would like to be) because it will stir up the nutters.