>> Following on the heels of MC Hammer and salsa legend Willie Colon, rock ‘n’ roll pioneer and TV commercial pitchman Little Richard brings his falsetto scream to a free outdoor concert, with openers D.C. female soul vets, the Jewels. 7 to 9 p.m. at at Woodrow Wilson Plaza, 1300 Pennsylvania Ave. >> Emmanuel Jal, a “lost boy of Sudan” who is the subject of his own upcoming documentary, War Child, will perform his…

FRIDAY: >> The city’s free concert series follows MC Hammer with a rare appearance by salsa legend Willie Colon, 7-9 p.m. at Woodrow Wilson Center. >> President Nixon’s White House counsel John Dean will be at Politics and Prose to discuss his book, Broken Government, which examines “the institutional damage he believes the Republican Party has inflicted on the executive, legislative, and judicial branches of government during the Bush administration.” 7 p.m. He’ll also be…

Today’s kids probably think rappers have always been purveyors of commercial goods. 50 Cent has Vitamin Water. Diddy and Burger King are partners. Common probably even folds every shirt at The Gap. However, there was a time when rappers weren’t viable salespeople because their music wasn’t reaching a broad segment of the population. In 1990, a Bay Area entertainer who went by the moniker MC Hammer helped set rap on track to be a cultural…

FRIDAY: >> Please Hammer, don’t hurt ’em. Landmark R&B radio station WPGC celebrates 19 years of playing 18 jams in a row with a concert at the Verizon Center that features LL Cool J, MC Hammer, Chuck Brown, EU, Naughty By Nature, Bow Wow, MC Hammer and Lisa Lisa. Apparently Cult Jam had previous commitments. $45 – $70, 7 p.m. (Kyle Gustafson) >> You may have missed La Didone last weekend, but if you…