WASHINGTON—President-elect Joe Biden is set to be sworn in as president on Jan. 20 amid unparalleled security measures and the pandemic lockdown, making it one of the most untraditional inaugurations in U.S. history. Like many predecessors, Biden is going to be sworn in on the steps of the Capitol building. But the traditional parade down Pennsylvania Avenue, which normally draws hundreds of thousands of Americans, has been canceled, to be replaced by a virtual parade. Inaugural balls have been canceled as well. The viewing stand near the White House has been dismantled, making this event likely the smallest inauguration in...