He can give it in the Capitol Rotunda.
CAPITOL ROTUNDA. Standing Capacity: 1500 Seated: 900
That’s just as big as the HOR. As a matter of fact, he should give it there not just this year, but every year until Pelosi no longer holds the HOR gavel.
Great place.
+1
Prior to his speech there should be a procession where he nails a copy of his speech to the doors of the HOR.