GRAND RAPIDS, Mich. — Gone were the lasers and the smoke machines.

Gone were the glamorous adult children, dressed up and shined as if awaiting their Rose Garden debut.

Gone, even, were the frenzied, angry, overflow crowds — that unlikeliest of electoral nourishment that has sustained Donald J. Trump for nearly 17 months.

Instead, when Mr. Trump took the stage exactly 30 minutes after midnight for his final rally as a candidate, his 34-minute speech felt like an afterthought, the slapdash add-on that it was.

“We’re hours away from a once-in-a-lifetime change,” Mr. Trump said. “Today is our Independence Day, the day the American working class is going to strike back, finally.”