On Aug. 12, Toni Braxton will be performing at the 31st annual Martin Luther King Jr. Concert Series. And on Aug. 19, the O’Jays and Gladys Knight will take the stage. The concerts begins at 7:30 p.m in Brooklyn. Concertgoers should arrive at Brooklyn Avenue between Rutland Road and Winthrop Street. A limited number of chairs will be available on a first-come, first-serve basis. Brooklyn Borough President Marty Markowitz is hosting the concert series. For more information, call 718-222-0600 or visit www.brooklynconcerts.com.