Welcome back! Here are a few fun ways to kick off the second semester.

• The Corcoran Gallery of Art is offering free admission all day today with additional promotions in honor of Martin Luther King, Jr.
• Head over to the McEvoy Auditorium at the Smithsonian American Art Museum on Tuesday to see the documentary “The Loving Story” before it airs on HBO in February. The documentary follows the interracial marriage of Mildred and Richard Loving, whose union helped shape American marriage laws. The event begins at 6:45 p.m. Admission is free.

And here’s something jaw-dropping:
The creators of “How I Met Your Mother” are finally casting the role of the mother! Look out world.