In celebration of July 4, the Capitol Fourth concert takes place at the United States Capitol at 8 p.m. (Bill O'Leary )

The Going Out Guide recommends free things to do for every day of the week.

Book signing

Author and Washington Post multiplatform editor Bill Walsh will be at Politics and Prose to sign copies of his new book, "Yes, I Could Care Less: How to Be a Language Snob Without Being a Jerk."

7 p.m. Politics and Prose, 5015 Connecticut Ave. NW. 202-364-1919.

'Harold Night' of improvisation

Can you think fast on your feet? For the teams at Washington Improv Theater, that skill is a necessity. Join them for "Harold Night," a weekly improvisation session during which they play out scenes based on audience suggestions.

9:40 p.m. Washington Improv Theater, 1835 14th St. NW. 202-204-7770.

Mapuna Leo

In conjunction with the Smithsonian Folklife Festival, which runs through July 7, this group of Hawaiian musicians, hula dancers and academics performs at the Kennedy Center in celebration of their culture and language.

6 p.m. Kennedy Center, Millennium Stage, 2700 F St. NW. 202-467-4600.

'A Capitol Fourth' concert

Before the big fireworks show on the Mall, take in the grand Fourth of July concert on the West Lawn of the Capitol. The concert features host Tom Bergeron, Barry Manilow, "American Idol" winners Candice Glover and Scotty McCreery, Darren Criss of "Glee" and others.

8 p.m. U.S. Capitol, East Capitol and First streets NE.

Historic Theater: Greensboro sit-ins

Step back in time at the National Museum of American History to meet a civil rights activist in the 1960s and participate in a training session for a sit-in at the Greensboro Lunch Counter.

11:30 a.m. National Museum of American History, 14th Street and Constitution Avenue NW. 202-633-1000.

'Bearing Witness'
The Corcoran Gallery of Art screens this 2005 documentary about the experiences of female journalists covering wars across the globe.

3 p.m. Corcoran Gallery of Art, 500 17th St. NW. 202-639-1700.

'Rhyme Time!'
As part of the D.C. Hip-Hop Theater Festival, which runs through July 14, this event features hip-hop artist Christylez Bacon, nursery rhymes, folk tales and more.

6 p.m. Kennedy Center Millennium Stage, 2700 F St. NW.