And it will be more than two decades before it happens again. The next time Martin Luther King Jr. Day falls on Jan. 20 during an inauguration year will be the 2053 Inauguration Day for the 2052 Presidential Election.

Monday will be an especially noteworthy day on America’s calendar — and it’s one that will be marked by various closings, including that of financial markets. For starters, it’s Martin Luther King Jr.