The terms of the President and Vice President shall end at noon on the 20th day of January.(from the Constitution since 1937) Little know fact: between the swearing in at noon and the parade, the old president moves out of the White House and the new president moves in.

MLK holiday (I think it is always the third Monday in Jan.) is Monday, Jan. 19 which is the day before the Inauguration.

Also that week on Thursday, Jan. 22 is the March for Life.

The Mall will be hopping from Sunday until Thursday of that week.