One of the time-honored displays of bipartisanship after the president’s swearing-in is the inaugural luncheon in Statuary Hall. Mr. Trump, known for being consistently late to his political rallies, spoke for more than 30 minutes to an overflow crowd in Emancipation Hall after his inaugural speech. It pushed the day’s program back.

Under the Constitution’s 20th Amendment, the newly elected president of the United States takes office on Jan. 20 (unless that’s a Sunday, in which case it moves to Jan. 21). For Trump’s (second) big day, the pomp and circumstance will include performances by Carrie Underwood and the Village People, a military parade, and formal balls.