PlayMakers Repertory Company alternates two related plays over the next month, starting on Saturday with a double-header. Lorraine Hansberrys 1959 drama, A Raisin in the Sun follows an African-American familys move into an all-white neighborhood, while Bruce Norriss 2009 Pulitzer Prize winner,Clybourne Park, tells the story of the white family that sold the home to them. Paul Green Theatre, UNC-CH. Raisin - 2 p.m. Saturday and Sunday; Clybourne - 7:30 p.m. Saturday (through 3/3). $15-$50. 919-962-7529; playmakersrep.org.