I do believe that you are correct, the dinner is a function of the WH Correspondents' Assn, and it's their din din. A prez could not cancel the event.
That said, the WH Correspondents' Assn certainly chooses to characterize themselves by who speaks, and says what, n'est ce pas?
67 posted on 04/29/2018 8:59:24 PM PDT by Seaplaner
(Never give in. Never give in. Never...excepto for convictions of honour and good sense. W. Churchill)